JP2003323691A - Traffic signal system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a traffic signal system for instructing the validity/invalidity of the railroad crossing of a vehicle to the driver of the vehicle when the vehicle passes the railroad crossing to make it possible for the vehicle to safely pass the railroad crossing even when a vehicle dwells in the periphery of the railroad crossing. <P>SOLUTION: This traffic signal system is set along a road A in the neighborhood of a railroad crossing B across the road A, and provided with a dwell detecting device 10 ahead of the railroad crossing B, and a railroad crossing signal device 20 and a railroad crossing signal display device 30 after it. The railroad crossing signal device 20 transmits a lamp color signal to a lamp 22 to make the lamp 22 light blue, flash yellow, flash red or light red based on the combination of a train approach signal with a dwell signal transmitted from the dwell detecting device 10. The railroad crossing signal display device 30 displays character data such as 'Watch out for a railroad', 'Congestion ahead' or 'Train is approaching' are displayed based on the combination of the dwell signal transmitted from the dwell detecting device 10 and the lamp color signal to be transmitted to the lamp 22. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a traffic signal system which, when a vehicle passes a railroad crossing, instructs a driver of the vehicle whether or not the vehicle can cross the railroad crossing.

[0002]

2. Description of the Related Art Conventionally, a traffic signal system that displays a signal in blue, yellow, red or the like to control the passage of a vehicle is lit in blue when a train is not approaching the railway crossing. If it blinks yellow and the train approaches the railroad crossing when it is lit in blue or blinks in yellow, it switches to yellow lighting for instructing deceleration and then red lighting for instructing stop immediately. Further, this conventional traffic signal system immediately returns to the blue lighting or the yellow blinking for instructing the progress immediately after the train has passed the railroad crossing.

When the conventional traffic signal system is lit in blue or blinking in yellow, the vehicle attempting to enter the railroad crossing must be stopped before the railroad crossing.
Since there is no regulation under the Road Traffic Law, the vehicle can smoothly pass through the railroad crossing, and the staying around the railroad crossing is reduced.

[0004]

However, the conventional traffic signal system has the following problems. The above-mentioned conventional traffic signal system controls signals according to whether or not a train is approaching a railroad crossing, but a railroad crossing where such a traffic signal system is installed generally has a large traffic volume, Is likely to occur. Therefore, when the signal is controlled depending on whether or not the train is approaching the railroad crossing as described above, even if the blue light is lit or the yellow light blinks when the train is not approaching the railroad crossing, the vehicle is in front of the railroad crossing. If there is a stagnation, there is no space for the vehicle to pass through after crossing the railroad crossing and there is a possibility that a vehicle may have to stop inside the railroad crossing may lead to an unexpected situation and improve safety. Was desired.

An object of the present invention is to provide a traffic signal system for instructing a driver of the vehicle whether or not the vehicle should pass the railroad crossing when the vehicle crosses the railroad crossing, even if the vehicle stays around the railroad crossing. Is to be able to safely cross the railroad crossing.

[0006]

The present invention has the following features in order to solve such problems. In the following description of the means, the configuration corresponding to the embodiment will be shown in parentheses as an example. Reference numerals and the like are reference numerals and the like of the drawings described later.

The invention according to claim 1 is installed along a road in front of a railroad crossing that crosses the railroad crossing in the vehicle traveling direction, and a staying detection unit for detecting the staying of a vehicle on the road in front of the railroad crossing (for example, in FIG. 1). The stay detection device 10) shown, a first display unit (for example, a lamp 22 shown in FIG. 2) installed near the entrance of the railroad crossing and displaying a signal indicating whether or not the railroad crossing can pass, and the vicinity of the entrance of the railroad crossing. A second display unit (for example, the display unit 32 shown in FIG. 2) that is installed in the vehicle and displays traffic conditions around the railroad crossing.
According to the content indicating whether the vehicle on the road ahead of the railroad crossing detected by the stay detection unit is staying and the content indicating whether the train is approaching the railroad crossing, the railroad crossing A first control unit (for example, a control unit 21 shown in FIG. 2) that controls the display of the selected signal on the first display unit by selecting a signal indicating whether or not the passage is possible, and the stay detection unit. Depending on the content indicating whether the vehicle on the road ahead of the detected level crossing is staying and the content indicating whether the train is approaching the level crossing, the traffic situation around the level crossing is determined by And a second control unit (for example, the control unit 31 shown in FIG. 2) that controls the display on the second display unit.

According to the first aspect of the present invention, the stay detection unit is installed along a road in front of the railroad crossing that crosses the crossing in the vehicle traveling direction, detects the stay of the vehicle on the road in front of the railroad crossing, and The display unit 1 is installed near the entrance of the railroad crossing,
A signal indicating whether or not the railroad crossing is possible is displayed, and the second display section
The content is installed near the entrance of the railroad crossing and displays the traffic condition around the railroad crossing, and the first control unit indicates whether or not the vehicle on the road ahead of the railroad crossing detected by the stay detection unit is staying. According to the content indicating whether the train is approaching the railroad crossing, select a signal indicating whether the railroad crossing is possible,
The second control unit controls to display the selected signal on the first display unit, and the second control unit indicates whether the vehicle on the road ahead of the railroad crossing detected by the staying detection unit is staying. And the traffic status around the railroad crossing is controlled to be displayed on the second display unit according to the content indicating whether or not the train is approaching the railroad crossing.

Further, as in the invention described in claim 2, in the traffic signal system according to claim 1, when the train is not approaching the railroad crossing, the first control unit is on the road in front of the railroad crossing. When the stagnation detection unit detects that the vehicle is not stagnation, a signal instructing to pass through the railroad crossing is selected and displayed on the first display unit, and the vehicle stagnates on the road in front of the railroad crossing. When it is confirmed by the staying detection unit that the vehicle has stopped, once it is confirmed that the vehicle can stop and pass the railroad crossing, a signal for instructing to pass the railroad crossing is selected and displayed on the first display unit. If the train is approaching a railroad crossing, the signal indicating that the vehicle speed is reduced to approach the railroad crossing is selected and displayed on the first display unit, and then the railroad crossing is not passed. Select the signal that instructs the It is preferable to control so as to display the part, further, as in the invention of claim 3, wherein, in a traffic light system according to any one of claims 1 or 2,
When the train is not approaching the railroad crossing and the stay detection unit detects that the vehicle is staying on the road ahead of the railroad crossing, the second control unit displays on the road ahead of the railroad crossing. It is preferable to display that the vehicle is staying and to display on the second display unit that the train is approaching the railroad crossing when the train is approaching the railroad crossing.

Further, as in the invention described in claim 4, in the traffic signal system according to any one of claims 1 to 3, it is indicated whether or not the vehicle is staying on the road in front of the railroad crossing. A first control table (for example, Table E shown in FIG. 3) that associates a combination of the content and a content indicating whether or not the train is approaching a railroad crossing with a signal indicating whether or not the railroad crossing is possible 1 storage unit (for example, the memory 21a shown in FIG. 2), and the first control unit indicates whether the vehicle on the road ahead of the railroad crossing detected by the stay detection unit is staying. And a content indicating whether or not the train is approaching the railroad crossing, referring to the first control table stored in the first storage unit, and displaying a signal indicating whether or not the railroad crossing is possible. Control to select and display on the first display unit More preferably, as in the invention according to claim 5, in the traffic signal system according to any one of claims 1 to 4, it is determined whether or not the vehicle is staying on the road in front of the railroad crossing. A second method of associating a combination of the content shown and a content indicating whether or not a train is approaching a railroad crossing with character data indicating a traffic situation around the railroad crossing
Of the control table (for example, Table E shown in FIG. 3) is stored in the second storage unit (for example, memory 31a shown in FIG. 2), and the second control unit is detected by the retention detector. According to the content indicating whether the vehicle on the road ahead of the railroad crossing is staying and the content indicating whether the train is approaching the railroad crossing, the first storage unit stored in the second storage unit. It is more preferable to refer to the control table No. 2 and select the character data indicating the traffic condition around the railroad crossing and display it on the second display unit.

Therefore, when the stay detector detects that the vehicle is staying on the road ahead of the railroad crossing, a signal is issued to the driver of the vehicle to stop the vehicle and then pass through the railroad crossing. Since it is displayed by the display unit and you can pass through the railroad while paying attention to the accumulation of vehicles on the road ahead of the railroad crossing,
The safety is improved. Furthermore, when the retention detector detects that the vehicle is retained on the road ahead of the railroad crossing,
Character data indicating that the vehicle is staying on the road in front of the railroad crossing is displayed by the traffic condition display unit, so the driver of the vehicle passing through the railroad crossing has the vehicle staying on the road in front of the railroad crossing. The situation can be clearly confirmed and a traffic signal system with higher safety can be provided. Further, when the train is approaching the railroad crossing, character data indicating that the train is approaching the railroad crossing is displayed on the traffic condition display unit, so that the driver of the vehicle passing through the railroad crossing can see the train approaching the railroad crossing. It is possible to clearly grasp the current situation and realize a traffic signal system with higher safety. That is, according to the traffic signal system of the present invention, it is possible to accurately control the traffic signal according to the stagnation of vehicles around the railroad crossing, and the vehicle can safely pass through the railroad crossing.

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION A traffic signal system 100 to which the present invention is applied will be described in detail below with reference to FIGS. 1 is a schematic diagram showing an overall configuration of a traffic signal system 100 to which the present invention is applied, FIG. 2 is a schematic block diagram showing an internal configuration of a traffic signal system 100 to which the present invention is applied, and FIG. 4 is a table showing the contents of signal control by the traffic signal system 100 to which the present invention is applied, and FIG. 4 is a diagram showing an installation example of the lamp 22 and the display unit 32.

As shown in FIG. 1, the traffic signal system 100 is installed along a road A in the vicinity of a railroad crossing B that intersects with the road A. The stay detection device 10, the railroad crossing signal device 20, and the railroad crossing signal display device. It is configured by including 30 and the like. Also,
It is assumed that the traveling direction of the vehicle traveling on the road A is the direction indicated by reference numeral C in the figure.

First, the stay detecting device 10 will be described.
The staying detection device 10 has a predetermined position (for example, in front of the railroad crossing B) where the vehicle has traveled along the road A in the direction indicated by the traveling direction C in the figure and passed through the railroad crossing B (hereinafter referred to as front of the railroad crossing B). It is installed at a position away from the boundary D1 between the road A and the railroad crossing B by the length of the vehicle of the large cargo trailer or more), and monitors the stagnation state of vehicles in the monitoring area on the road A in front of the railroad crossing B.

As shown in FIG. 2, the residence detecting device 10 is
The sensor unit 11 and the control unit 12 are provided, and the control unit 12
When it is detected that the vehicle is staying on the road A in front of the crossing B based on the vehicle detection signal input from the sensor unit 11, a staying signal indicating that the vehicle is staying is output to the crossing signal device 20 and the crossing. The signal is transmitted to the signal display device 30. The control unit 12 determines whether or not the vehicle stays, based on the presence of the vehicle and the traveling speed indicated by the vehicle detection signal.

Next, the crossing signal device 20 will be described.
The railroad crossing signal device 20 is, for example, 2 meters from a boundary D2 between the road A and the railroad crossing B behind the railroad crossing B at a predetermined position before the vehicle passes through the railroad crossing B (hereinafter referred to as the rear railroad crossing B). Alternatively, it is installed at a position within a few meters such as 3 meters) and displays a signal for instructing the driver of the vehicle entering from the rear of the railroad crossing B whether or not the railroad crossing B can pass.

The crossing signal device 20, as shown in FIG.
A control unit 21, a memory 21a, and a lamp 22 are provided. The control unit 21 reads the program and character data for realizing the signal display content shown in Table E of FIG. 3 from the memory 21a, and indicates that the train received from the train approach detection device (not shown) is approaching the railroad crossing B. Based on the combination of the train approach signal shown and the staying signal received from the staying detection device 10, a light color signal is transmitted to the light device 22, and the light device 22 blinks and lights up in blue, yellow, or red. . Here, the program and the character data that realize the signal display contents shown in Table E of FIG. 3 are stored in advance in the memory 21a.

Here, when the light 22 is illuminated in blue or blinks yellow, the vehicle must pass without stopping when passing the railroad crossing B. When the red light blinks, the vehicle must stop before passing a stop line (not shown) provided at the entrance (boundary D2) of the crossing B before passing through the crossing B. I won't. Further, as described later, when the lighting device 22 is illuminated in red, the vehicle must continue to stop before the stop line until the illumination in red is released.

The control unit 21 receives a train approach signal indicating that the train is approaching railroad crossing B from the train approach detection device, or receives a stay signal from the stay detection device 10 ( That is, when there is no train approach signal and there is no stay signal, a light color signal is transmitted to the lamp 22 to turn on blue, blink yellow, or blink red (first in Table E shown in FIG. 3). See lines E1 to third line E3). In this case, whether the lamp 22 is lit blue or blinks yellow,
Alternatively, whether to blink the red color is determined according to the degree of danger when the vehicle passes through the railroad crossing B in accordance with the Road Traffic Law, and the installation location of the railroad crossing B and the average around the railroad crossing B are determined. It is preset in consideration of various traffic conditions.

Further, the control unit 21 has no train approach signal,
When there is a stay signal (that is, when the vehicle is staying in front of the railroad crossing B, but the train is not approaching the railroad crossing B), a light color signal is transmitted to the lamp 22 to blink red ( See Table 4, row E4 of FIG. 3). In this case, the control unit 2
1, the lamp 22 may be extinguished, and the character data "Caution crossing!" May be displayed in a blinking manner on the display 32 of the crossing signal display device 30, which will be described later, that is, a crossing without a traffic signal installed. According to the Road Traffic Law when crossing the road, when the vehicle passes through the railroad crossing B, first stop the vehicle before passing the railroad crossing, and there is a space for the vehicle in front of the railroad crossing B. It is also possible to instruct the driver to pass the railroad crossing B all at once after confirming whether or not there is such a space, and after confirming the safety of the left and right sides (see the table in FIG. 3). (See line 5, E5).

Further, when there is a train approach signal (that is, when the train approaches the railroad crossing B while the front of the railroad crossing B is staying), the control unit 21 does not depend on the presence of the stay signal. , A light color signal is transmitted to the lamp 22 to immediately switch from the currently displayed signal (blue lighting, yellow blinking, red blinking, or extinguished light) to yellow lighting for a predetermined time (for example, 2
After a short time such as seconds or 3 seconds), the red light is turned on (see the sixth row E6 of Table E shown in FIG. 3).

The lamp 22 is preferably installed at a height of, for example, about 7 to 8 meters from the ground so that the signal can be sufficiently confirmed even from a distant vehicle.

Next, the crossing signal display device 30 will be described. The railroad crossing signal display device 30 displays the railroad crossing B along the road A.
It is installed at a predetermined position behind the railroad crossing signal device 20 (for example, the installation position of the railroad crossing signal device 20), and the driver of the vehicle entering from the rear of the railroad crossing B should be careful when passing through the railroad crossing B. Or character data such as "railway crossing caution", "during front stagnation", "during train approach", etc. (see FIG. 3) are displayed.

As shown in FIG. 2, the level crossing signal display device 30 includes a control unit 31, a memory 31a, and a display unit 32. Here, the display unit 32 is composed of, for example, a light emitting diode type electronic display, and displays the character data input from the control unit 31. Further, the display unit 32 allows the displayed characters to be sufficiently confirmed even from a distant vehicle,
For example, it is preferably installed at a height of about 7 to 8 meters from the ground. Note that the display unit 32 is not limited to the light emitting diode type electro-optical display as long as the display content can be sufficiently confirmed from a distance, and any display unit may be used.

The control unit 31 reads the program and character data for realizing the signal display contents shown in Table E of FIG. 3 from the memory 31a, and the stay signal transmitted from the stay detecting device 10 and the railroad crossing signal device 20. Combination with the transmitted light color signal (that is, in other words, a combination of content indicating whether the vehicle is staying and content indicating whether the train is approaching level crossing B) Based on the corresponding character data (for example, “Careful crossing!”,
"Staying in front", "coming to train") is read from the memory 31a and displayed on the display unit 32. Here, the program and the character data that realize the signal display contents shown in Table E of FIG. 3 are stored in advance in the memory 31a.

When there is no stay signal or train approach signal (that is, there is no train approaching railroad crossing B,
In addition, when there is no stay in front of the railroad crossing B), the character data is not displayed on the display unit 32 (first row E of the table E shown in FIG. 3).
1, see second line E2). At this time, the light color signal instructs to turn on blue or blink yellow. Even when there are no trains approaching level crossing B and there is no stagnation in front of level crossing B (when there is no stagnation signal or train approach signal), the visibility around level crossing B is poor, and the light color signal indicates a red blinking. In this case, the control unit 3
1 continuously displays, for example, character data "Caution for level crossing!" On the display unit 32 (the third line E3 of the table E shown in FIG. 3).
reference).

Further, the control unit 31 has a stay signal and the light color signal indicates blinking red (that is, there is no train approaching the crossing B, but there is staying in front of the crossing B).
In the display unit 3, for example, the character data “Staying forward” is displayed.
2 consecutively (see the fourth row E4 of Table E shown in FIG. 3). Even if there is no train approaching railroad crossing B, even when there is stagnation in front of railroad crossing B (when there is a stagnation signal), the light-color signal indicates that the light is off, and when crossing a railroad crossing without a traffic signal. When the driver is urged to cross the railroad crossing B in accordance with the Road Traffic Law, the control unit 31 continuously displays, for example, character data “Crossroad crossing caution” on the display unit 32 (see the table shown in FIG. 3). See E, 5th row E5).

Furthermore, the control unit 31 controls the case where the lamp color signal indicates the red lighting regardless of the presence or absence of the stay signal (that is,
When the train is approaching railroad crossing B), for example, character data "train approaching" is displayed blinking on display unit 32 (see the sixth line E6 of table E shown in FIG. 3).

Here, the display unit 32 displays, for example, in order that the displayed characters can be sufficiently confirmed even from a distant vehicle.
It is preferably installed at a height of about 7 to 8 meters above the ground.

Further, the driver recognizes the current traffic condition by combining the signal from the lamp 22 of the crossing signal device 20 and the character data of the display section 32 of the crossing signal display device 30. If the device 22 and the display unit 32 are separated from each other, it may be difficult to confirm and the driver's burden may increase, or the traffic situation may be recognized by only one of the information, which may cause an unexpected situation. As shown in FIG. 4, the lamp 22 of the crossing signal device 20 and the display 32 of the crossing signal display device 30.
And are preferably provided in positions close to each other.

As described above, the traffic signal system 100 to which the present invention is applied is installed along the road A in the vicinity of the railroad crossing B crossing the road A, and is provided with the staying detection device 10 in front of the railroad crossing B. A crossing signal device 20 and a crossing signal display device 30 are provided behind the road B. The railroad crossing signal device 20 includes a train approach signal for notifying that a train is approaching,
Based on the stay signal that notifies the stay condition in front of the railroad crossing B transmitted from the stay detection device 10, a light color signal is transmitted to the lamp 22 to turn on blue, yellow, red, or red. At this time, the crossing signal display device 30 combines the stay signal transmitted from the stay detection device 10 and the light color signal transmitted to the lamp 22 (that is, in other words, whether the vehicle stays or not). Combination of the content indicating whether or not and the content indicating whether or not the train is approaching railroad crossing B)
On the basis of the above, the character data such as "Caution for crossing!", "Staying ahead", "Nearing train" is displayed to the driver of the vehicle approaching the crossing B.

Therefore, when the crossing signal device 20 receives the staying signal from the staying detecting device 10, the crossing signal device 20 sends a light color signal to the lamp 22 and blinks in red. It will stop once at level crossing B
Since it is possible to pass the railroad crossing B while paying attention to the staying condition in the front, the safety can be improved. Further, when the crossing signal display device 30 receives the staying signal from the staying detecting device 10,
Since the character data indicating that the front of the crossing B is staying is displayed, the driver of the vehicle passing through the crossing B can easily and clearly check the situation where the front of the crossing B is staying, which is more safe. A high traffic signal system 100 can be provided. Further, since the railroad crossing signal display device 30 displays character data indicating that the train is approaching the railroad crossing B when the train is approaching the railroad crossing B, the driver of the vehicle passing through the railroad crossing B is displayed. ,
A traffic signal system 10 that has a high degree of safety because the situation where a train is approaching railroad crossing B can be clearly understood.
0 can be realized.

The description of the present embodiment shows an example of the traffic signal system according to the present invention, and the present invention is not limited to this. The detailed configuration, detailed operation, and various numerical values of the traffic signal system 100 according to the present embodiment can be appropriately changed without departing from the spirit of the present invention.

For example, the character data shown in Table E of FIG.
It can be set freely as long as it has the same meaning without being limited to "railway crossing!", "Staying in front", "train approaching", and the like.

The control unit 21 of the crossing signal device 20 and the control unit 31 of the crossing signal display device 30 are respectively
Although the signal display shown in Table E of FIG. 3 is performed by executing the program stored in the memories 21a and 31a in advance (programmed logic), the present invention is not limited to this, and the processing by the program is not performed. The signal display may be performed by hardware having a contact relay or a digital IC (wired logic).

[0036]

According to the present invention, when the stay detecting unit detects that the vehicle stays on the road ahead of the railroad crossing,
A signal that instructs the driver of the vehicle to stop the vehicle and then pass through the railroad crossing is displayed on the signal display part, and you can pass through the railroad crossing while paying attention to the accumulation of vehicles on the road in front of the railroad crossing. Is improved. Further, when the stay detection unit detects that the vehicle is staying on the road in front of the railroad crossing, the traffic condition display unit displays character data indicating that the vehicle is staying on the road in front of the railroad crossing. Therefore, the driver of the vehicle passing through the railroad crossing can clearly and easily confirm the situation in which the vehicle is staying on the road ahead of the railroad crossing, and a traffic signal system with higher safety can be provided.
Further, when the train is approaching the railroad crossing, character data indicating that the train is approaching the railroad crossing is displayed on the traffic condition display unit, so that the driver of the vehicle passing through the railroad crossing can see the train approaching the railroad crossing. It is possible to clearly grasp the current situation and realize a traffic signal system with higher safety.
That is, according to the traffic signal system of the present invention, it is possible to accurately control the traffic signal according to the stagnation of vehicles around the railroad crossing, and the vehicle can safely pass through the railroad crossing.

[Brief description of drawings]

FIG. 1 is a schematic diagram showing an overall configuration of a traffic signal system to which the present invention is applied.

FIG. 2 is a schematic block diagram showing an internal configuration of a traffic signal system to which the present invention is applied.

FIG. 3 is a table showing contents of signal control by a traffic signal system to which the present invention is applied.

FIG. 4 is a diagram showing an installation example of a lamp and a display unit shown in FIG.

[Explanation of symbols]

100 traffic signal system 10 Residence detection device 11 Sensor section 12 Control unit 20 Crossing signal device 21 Control unit 21a memory 22 lamps 30 crossing signal display device 31 Control unit 31a memory 32 display

Claims (5)

[Claims] Claims: 1. A stagnation detection unit installed along a road in front of a railroad crossing that crosses the crossing in the vehicle traveling direction, and a stagnation detection unit that detects stagnation of a vehicle on the road in front of the railroad crossing; A first display unit that displays a signal indicating whether or not the vehicle can pass, a second display unit that is installed near the entrance of the railroad crossing and displays traffic conditions around the railroad crossing, and a front of the railroad crossing detected by the stay detection unit. A signal indicating whether or not the railroad crossing is allowed is selected according to the content indicating whether the vehicle on the road is stagnant and the content indicating whether the train is approaching the railroad crossing, and the selection is performed. The first signal
The first control unit for controlling to display on the display unit, the content indicating whether the vehicle on the road ahead of the railroad crossing detected by the stay detection unit is staying, and the train is approaching the railroad crossing. A traffic signal system, comprising: a second control unit that controls to display the traffic condition around the railroad crossing on the second display unit according to the content indicating whether or not there is the traffic signal. 2. The traffic signal system according to claim 1, wherein when the train is not approaching the railroad crossing, the first control unit indicates that the vehicle is not staying on the road ahead of the railroad crossing. When detected by the detection unit, a signal for instructing to pass through the railroad crossing is selected and displayed on the first display unit, and the fact that the vehicle is staying on the road in front of the railroad crossing is detected by the staying detection unit. When it is detected, once it is confirmed that the vehicle can stop and cross the railroad crossing, a signal for instructing to cross the railroad crossing is selected and displayed on the first display unit, and the train is approaching the railroad crossing. in case of,
After selecting and displaying on the first display unit a signal instructing the vehicle to slow down and approach the level crossing, select a signal instructing to stop immediately without passing through the level crossing and select the signal. 1. A traffic signal system characterized in that it is controlled so as to be displayed on the display unit 1. 3. The traffic signal system according to claim 1, wherein the second control unit, when the train is not approaching the railroad crossing, detects a vehicle on the road in front of the railroad crossing. When the fact that the vehicle is staying is detected by the staying detection unit, it displays that the vehicle is staying on the road ahead of the railroad crossing, and when the train is approaching the railroad crossing, the train A traffic signal system characterized by controlling to display on the second display unit that the vehicle is approaching. 4. The traffic signal system according to any one of claims 1 to 3, wherein contents indicating whether a vehicle is staying on a road ahead of the railroad crossing and a train approaching the railroad crossing A first storage unit that stores a first control table that associates a combination of contents indicating whether or not there is with a signal indicating whether or not to cross the railroad crossing is provided, and the first control unit is configured by the retention detection unit. Stored by the first storage unit according to the content indicating whether the vehicle on the road ahead of the detected level crossing is staying and the content indicating whether the train is approaching the level crossing. Also, the traffic signal system is characterized in that a signal indicating whether or not the railroad crossing can be passed is selected with reference to the first control table and is displayed on the first display unit. 5. The traffic signal system according to any one of claims 1 to 4, wherein contents indicating whether or not a vehicle is staying on a road ahead of the railroad crossing and that a train is approaching the railroad crossing. A second storage unit that stores a second control table that associates a combination of contents indicating whether or not there is with the character data indicating the traffic condition around the railroad crossing is provided, and the second control unit is the retention unit. The second storage unit according to the content indicating whether the vehicle on the road ahead of the railroad crossing is detected by the detection unit and the content indicating whether the train is approaching the railroad crossing. The traffic signal system is characterized in that the character data indicating the traffic condition around the railroad crossing is selected and displayed on the second display unit by referring to the second control table stored by.