GB2560104A - A traffic light system - Google Patents
A traffic light system Download PDFInfo
- Publication number
- GB2560104A GB2560104A GB1800768.2A GB201800768A GB2560104A GB 2560104 A GB2560104 A GB 2560104A GB 201800768 A GB201800768 A GB 201800768A GB 2560104 A GB2560104 A GB 2560104A
- Authority
- GB
- United Kingdom
- Prior art keywords
- amber
- light
- red
- traffic
- phase
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
Classifications
-
- G—PHYSICS
- G08—SIGNALLING
- G08G—TRAFFIC CONTROL SYSTEMS
- G08G1/00—Traffic control systems for road vehicles
- G08G1/07—Controlling traffic signals
- G08G1/08—Controlling traffic signals according to detected number or speed of vehicles
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Traffic Control Systems (AREA)
Abstract
Traffic light system 100 comprises control unit 118 which operates two traffic lights 102 in a synchronized pattern and RADAR sensor 114 that detects vehicles approaching the traffic light(s). Each traffic light comprises a green, an amber and a red light which the control unit illuminates in a repeating sequence. It dynamically varies the duration of a red/amber phase and/or an amber phase of one or both traffic lights in response to information from the RADAR sensor (which may include speed or position of an oncoming vehicle). The amber or red/amber phase duration may be shorter when no oncoming vehicle is detected and longer when a vehicle is approaching, thus improving throughput of vehicles across a junction. The amber or red/amber phase may have a fixed duration when vehicles are approaching, which may otherwise be reduced by 0.25 seconds. The amber or red/amber phase may have a duration of between 2.75 and 3.25 seconds and be set at the lower end of the range when no approaching vehicle is detected and vice versa.
Description
(54) Title of the Invention: A traffic light system
Abstract Title: Varying the duration of an amber phase of synchronized traffic lights (57) Traffic light system 100 comprises control unit 118 which operates two traffic lights 102 in a synchronized pattern and RADAR sensor 114 that detects vehicles approaching the traffic light(s). Each traffic light comprises a green, an amber and a red light which the control unit illuminates in a repeating sequence. It dynamically varies the duration of a red/amber phase and/or an amber phase of one or both traffic lights in response to information from the RADAR sensor (which may include speed or position of an oncoming vehicle). The amber or red/amber phase duration may be shorter when no oncoming vehicle is detected and longer when a vehicle is approaching, thus improving throughput of vehicles across a junction. The amber or red/amber phase may have a fixed duration when vehicles are approaching, which may otherwise be reduced by 0.25 seconds. The amber or red/amber phase may have a duration of between 2.75 and 3.25 seconds and be set at the lower end of the range when no approaching vehicle is detected and vice versa.
Figure 1
1/2
110
Figure 1
2/2 <—> <—>
| Traffic Light A | Green | Amber =3 secs | Red | Red/Amber =2 secs | Green | |
| S' s. | ||||||
| Traffic Light B | Red | Red/Amber =2 secs | Green | Amber = 3 secs | Red |
Figure 2 <F->
Traffic Light A
| Green | Amber | Red | Red/Ambei | Green |
| =2.75 secs | =1.75 secs |
<—>
<—>
Traffic Light B
| Red | Red/Ambei =1.75 secs | Green | Amber =2.75 secs | Red |
Figure 3
A TRAFFIC LIGHT SYSTEM
This invention relates to improvements in traffic light systems, in particular portable or temporary traffic light systems.
It is well known to control the flow of vehicles between two points by placing a traffic light at each point that will control the movement of vehicles between the two points. The traffic light designs are regulated by the laws of the country in which they are used, and in many countries such as the UK, they have three colours of light. A green light is illuminated to indicate a vehicle (a car, or lorry, or bus or a cyclist) can pass, and this is always accompanied by the other light showing a red light which means vehicles cannot pass. The traffic light that is showing a green light then changes to red and the other changes to a green light, so that vehicles can cross in the opposite direction.
The change from red to green, or green to red, does not happen instantly. Instead, an inter-red and an intergreen phase is provided. During the inter-red phase, an amber light is displayed alongside the red. This gives the driver time to prepare to set off. During the inter-green phase the green is turned off an amber light is displayed. This warns an approaching driver that the light is turning red and that they should stop.
The amber light and the amber/red combination define therefore warn an approaching vehicle that it should get ready to stop or get ready to start respectively. Traffic regulations in force in the UK determine the allowable times for the different phases of the sequence, and a control unit operates the lights in accordance with these allowable times. The current regulation at the time of filing of this application is the Traffic Signs Regulations and General Directions 2002, UK. The timings for the green and the red phase can be varied considerably in length, but the duration of the amber phase and the red/amber phase must be 3 seconds and 2 seconds respectively with an allowable tolerance of plus or minus 250 milliseconds. The timings will be preset at a fixed duration by the control unit within this allowable range.
It is known to link the traffic lights to one or more radar sensors that detect oncoming vehicles. When detected, the duration of the green phase or the red phase can be varied to optimize the flow of traffic between the lights and can be anywhere from 5 seconds to 100 seconds or more. Getting as many vehicles through as possible is important if a queue is to be prevented and smooth traffic flow is to be achieved. Dynamically altering the duration of the red and green phases can also improve safety in a situation where a set of portable traffic lights are installed. For instance, at very quiet times where one vehicle is waiting on a red traffic light and nothing is approaching the other traffic light it is beneficial to change the red light to green earlier to allow the vehicle to cross. Not doing so could provoke the driver to jump the lights as they may assume the lights are stuck on the red phase which is dangerous.
It is an object of the present invention to provide an improved traffic light system that may increase the through flow of traffic across a junction whilst maintaining appropriate levels of safety.
According to a first aspect the invention provides a traffic light system comprising at least two traffic lights which are operated in a synchronized pattern, each traffic light comprising a green light, an amber light and a red light, a radar sensor apparatus associated with at least one of the traffic lights that detects oncoming vehicles, and at least one control unit that receives a signal from the or each radar sensor apparatus, the control unit being arranged to illuminate the lights of each of the traffic lights in a repeating sequence comprising: a green phase including illumination of the green light only, an amber phase including illumination of the amber light only, a red phase including illumination of the red light only, and then a red/amber phase including illumination of the amber light and red light only, characterised in that the system is configured to dynamically vary the duration of one or both of the red/amber phase and the amber phase for one or both traffic lights using information obtained from the radar detector.
The control unit may be arranged to vary the duration of one or both of the red/amber and the amber phase in response to the signal from the radar sensor apparatus. Alternatively, the radar sensor apparatus may determine the amount by which the duration may be varied and may pass this information to the control unit in the signal received by the control unit.
The system may be arranged to select a duration of the amber phase or amber/red phase that is shorter when an oncoming vehicle is not detected relative to the duration when an oncoming vehicle is detected.
The system may use information obtained from the radar during the phase or historical information obtained shortly prior to the phase, e.g. in the immediately preceding phase. By use of the term shortly prior to an amber or red/amber phase we mean a time that is within 1 second, or at most 2 seconds or perhaps 5 seconds of the start of change that moves the traffic light into that phase.
The radar sensor apparatus may detect the speed of a vehicle in a predetermined zone in front of the signal and the duration may be varied by an amount that is as a function of the speed of any approaching vehicle detected by the radar. Where the speed of a vehicle falls below a threshold the duration may be the same as would be used if no vehicle is present, e.g. a shorter duration. If the speed is above the threshold the longer duration may be used.
The radar sensor apparatus may also or alternatively detect the position of the vehicle in the zone and the duration may be varied by an amount that is as a function of the position of any approaching vehicle detected by the radar. If the vehicle is a long way from the signal the shorter duration may be used, and if closer the longer duration may be used.
The signals sent by the radar sensor apparatus to the control unit may include a flag or trigger signal, the trigger being issued if the vehicle speed exceeds a threshold or the vehicle distance to the signal is below a threshold. The duration of the amber of red/amber may be set according to whether a trigger signal is received to inform the choice of duration. For example a trigger signal may only be issued if the speed/distance together meets predetermined criteria. These criteria may be set according to whether or not it is safe for the vehicle to stop prior to the signal and may indicate a time required for the vehicle to stop. The control unit may not reduce the duration if it means the time required to stop exceeds the time from now until when the amber or red/amber will change.
The control unit may select a duration as a function of both the speed and positon of any detected vehicle as indicated by the information output from the radar sensor. The duration may be reduced if the vehicle is a long way from the signal and is moving slowly. The duration may not be reduced if the vehicle is close to the signal and moving faster, as in this later case reducing the time may not be safe. In this case, although a vehicle is present the same duration is used as the case where no vehicle is detected.
A faster car at a shorter distance may cause the amber or amber/red to have a longer timing to the nominal full 3 second and vice versa. For a slow car at a higher distance the timing can be reduced as the car will easily be able to come to a safe stop before the light turns red.
The zone of detection of the radar may extend in front of the signal for up to 60m. The cars travel at different speeds depending on the state of the signal.
By reducing the amber and red/amber phases of the sequence when it is deemed safe to do so because there is no approaching vehicle, the rate at which traffic can move through the signals can be increased. This is because the start of the next red phase or green phase is moved slightly earlier in time. Over an extended period of time there will be proportionately more times when traffic can flow than would be possible if the interphase times were not dynamically varied. On the other hand, keeping longer interphase periods when traffic is approaching ensures that safety is higher than would be the case if the shortened period was always used, allowing drivers more chance to stop on time in the case of the amber phase and more time for junction trapped vehicles to make a quick right turn across the junction in the case of the red/amber phase before traffic approaches from the other direction.
The amber phase may be set at a fixed value for use when vehicles are approaching, and may be reduced by 0.25 seconds when no vehicle is approaching. It may be reduced by a smaller amount, say 0.2 seconds, or as little as 0.1 second or even less. Over time all the small reductions will add up to give a meaningful improvement in traffic flow between the traffic lights.
The amber phase may be set by the control unit to have a duration of between 2.75 seconds and 3.25 seconds, being at or close to the lower end of the range when no approaching vehicle is detected and at or close to the upper end when an approaching vehicle is detected.
The red/amber may be set at a fixed value for use when vehicles are approaching, and may be reduced by approximately 0.25 seconds when no vehicle is approaching (or when not trigger signal has been issued by the radar apparatus). It may be reduced by a smaller amount, say 0.2 seconds, or as little as 0.1 second or even less. Over time all the small reductions will add up to give a meaningful improvement in traffic flow between the traffic lights.
The red/amber phase may be set by the control unit to have a duration of between 1.75 seconds and 2.25 seconds, being at or close to the lower end of the range when no approaching vehicle is detected and at or close to the upper end when an approaching vehicle is detected.
The system may include two radar sensors, one detecting traffic approaching a first traffic light and the other detecting traffic approaching the second traffic light. The control unit may determine the amber and red/amber phases for both lights by processing the signals from both of the radar sensors.
The duration of the amber phase of a first traffic light may be dynamically altered to be longer when the radar sensor detects a vehicle approaching the second traffic light compared with when no vehicle is approaching. Or it may be altered if a vehicle is approaching the first traffic light.
Similarly, the duration of the red/amber phase of a first traffic light may be dynamically altered to be longer when the radar sensor detects a vehicle approaching the second traffic light compared with when no vehicle is approaching. Or it may be altered if a vehicle is approaching the first traffic light.
The reduction should not exceed 0.25 seconds so as to fall within the allowable tolerances defined by the current traffic regulations.
The system may include more than two traffic lights, and each may be controlled by the control unit so that the red and red/amber phases vary dynamically in duration depending on whether a moving vehicle is approaching or not. There may be three, or four, or more traffic lights in the system.
The control unit may be arranged to illuminate the lights by producing control signals indicative of the phase of the lights at any given time. The system may include, as a part of each traffic light, a drive circuit that supplies current to each of the lights of the traffic light dependent on the value of the control signal received from the control unit.
The control unit may transmit control signals to each traffic light wirelessly, or to one traffic light via a wired connection and wirelessly to the other.
The control unit may be an integral part of one of the traffic lights such that the traffic light acts as a master traffic light, control signals being sent to the other traffic light which functions as a slave traffic light.
Each radar sensor may comprise an antenna, a signal generator that applies a waveform to the antenna and a signal processor that detects signals received by the antenna and from the transmitted signal and detected signal determines whether there is a vehicle within the detection range of the radar sensor. The radar sensor may transmit to the control unit a binary signal indicative of whether there is a moving vehicle or not, or a more detailed signal that may indicate one or more of: the number of moving vehicles detected, the distance from the traffic light to one or more detected vehicles, and the speed of one or more detected vehicles.
Where the radar sensor determines the distance and speed of a moving vehicle, the system may dynamically alter the duration of one or both of the amber phase and the red/amber phase depending on the distance and speed. For instance, if there is no vehicles close to the traffic light the duration of the phases may still be shortened as they would if there was no moving vehicle.
Therefore, in addition to reducing the amber and/or red- amber phases when there are no moving vehicles, the control unit of the system may additionally reduce the period if there are no moving vehicles within a predetermined distance of the traffic light, or if the speed and distance are such that there are no moving vehicles within a predetermined time of reaching the traffic light.
The control unit may receive these signals from the radar sensors wirelessly.
The traffic lights may comprise fixed traffic lights permanently installed at a junction or crossing.
The traffic lights may comprise temporary lights, or portable lights. They may include a power source for supplying power to the lights and the control unit and the radar sensors so that the traffic lights can be operated without connection to a mains supply.
The battery may be an integral part of one or more of the traffic lights, or may be a stand-alone battery. As an alternative to a battery a generator may be provided that is petrol or diesel driven and produces an appropriate electrical output.
According to a second aspect the invention provides a method of controlling at least two traffic lights each traffic light comprising a green light, an amber light and a red light, the method comprising operating each of the lights in a synchronized pattern whereby each of the traffic lights is illuminated in a repeating sequence comprising: a green phase including illumination of the green light only, an amber phase including illumination of the amber light only, a red phase including illumination of the red light only, and then a red/amber phase including illumination of the amber light and red light only, the method being characterised by the further steps of detecting whether a vehicle is approaching one of the traffic lights and dynamically varying the duration of one or both of the red/amber phase and the amber phase for one or both traffic lights using information provided by a radar apparatus associated with the traffic light that is configured to detect oncoming traffic.
The duration may be varied depending on whether or not an oncoming vehicle is detected during that phase or immediately prior to that phase, the method comprising causing the duration to be less when no oncoming vehicle is detected relative to the duration when an oncoming vehicle is detected.
The method may also comprise causing the duration of at least the red/amber phase to be shortened when there is an approaching vehicle but that vehicle is further than a predefined distance from the traffic light, or where the speed and distance are such that it will take longer than a predetermined minimum time to reach the traffic light. This may be set, for instance, at 3 seconds, and may assume that the vehicle speed is constant (even if not actually the case).
There will now be described, by way of example only, one embodiment of the present invention with reference to and as illustrated in the accompanying drawings of which:
Figure 1 shows an exemplary arrangement of a traffic light system according to the invention protecting a length of highway between two points;
Figure 2 shows the phasing of the two lights of the system when there is traffic approaching both lights, for instance during a busy period of the day; and
Figure 3 shows a modified phasing that is employed during a quiet time when there is no traffic approaching the second one of the lights.
As shown in Figure 1, an exemplary traffic light system 100 according to the present invention comprises two portable traffic lights 102, traffic light A 102a and traffic light B 102b, located at opposing ends of a stretch of highway 104. Each light 102a, 102b comprises a pole 106 which supports a light head 108, the light head comprising a housing for three lights 110 - one green 110a, one amber 110b and one red 110c. Each light 110 in this example comprises an array of coloured light emitting diodes (LED’s). The light head 108 also houses a drive circuit 112 which receives control signals and in response causes the lights 110 of the traffic lights 102 to illuminate in a sequence.
On top of each light head 108 in this example is a radar sensor apparatus 114 that monitors a portion of the road or radar detection zone 116 in front of each traffic light, i.e. in a direction away from the stretch of highway 104. Each radar sensor apparatus 114 produces an output signal indicating the presence of an approaching vehicle along with the speed of the vehicle and the distance from the traffic light 102.
This measurement is gated so that only vehicles close to the traffic light 102 are detected with ‘close’ meaning typically less than 100m but in practice, a practical implementation is a zone extending from the radar/light at 0m to more of the order of 40-60m away. If the signal passes the gate a trigger signal is sent to the control unit 118 which encodes the speed and distance information. In this example, the control unit 118 includes a processor 120 which processes this information to decide on the duration that is to be set for the red/amber and amber phases.
Both of the traffic lights 102 are connected to a control unit 118. The control unit 118 comprises a signal processor 120, a memory 122, and a set of program instructions 124 stored in the memory 122 that are run on the processor 120 when the system 100 is in use. The control unit 118 receives the output signals from the two radar sensors 114, and in use generates control signals that are transmitted to the drive circuit 112 of the two traffic lights 102.
The sequence of change of the traffic lights 102 in this example is set by the control unit 118 and may be coded in sequence in the controller code for the control unit 118. For use in the United Kingdom the sequence must be as follows:
Phase 1 - Green light illuminated only,
Phase 2 - Amber light illuminated only,
Phase 3 - Red light illuminated only,
Phase 4 - Red and Amber lights illuminated only,
Repeat phases 1 to 4.
Figure 2 shows these phases for the two traffic lights A and B 102a, 102b in the case where the radar sensors 114 detect approaching vehicles in the radar detection zone 116. As can be seen the duration of phases 2 and 4 are set at 3 seconds and 2 second respectively. This is set by the control unit 118.
Where the radar sensor apparatus 114 can also measure the speed of the vehicle in the detection zone 116 as well as the location in the detection zone 116, the reduction in duration can be made as a function of both the speed and the distance. A fast moving car close to the signal 102 may result in no reduction in duration, but if it is a slow moving car at the furthest distance in the detection zone 114 then the duration may be reduced as it may be assumed the vehicle can still stop safely before the stop signal 102.
Figure 3 shows how phases 2 and 4 are dynamically varied when there is no 5 approaching vehicle, or where there is a slow moving vehicle or a vehicle a long way from the signal 102 as described above.
When there is no vehicle approaching within the detection zone 116 of the radar 114 the light that is green, then the light that is red will move to green through a shorter
Red/Amber phase of 1.75 seconds. Similarly, when there is no vehicle approaching the light that is red, the amber period may be reduced to 2.75 seconds.
Claims (11)
1. A traffic light system comprising at least two traffic lights which are operated in a synchronized pattern, each traffic light comprising a green light, an amber light and a red light, a radar sensor apparatus associated with at least one of the traffic lights that detects oncoming vehicles, and at least one control unit that receives a signal from the or each radar sensor apparatus, the control unit being arranged to illuminate the lights of each of the traffic lights in a repeating sequence comprising: a green phase including illumination of the green light only, an amber phase including illumination of the amber light only, a red phase including illumination of the red light only, and then a red/amber phase including illumination of the amber light and red light only, characterised in that the system is configured to dynamically vary the duration of one or both of the red/amber phase and the amber phase for one or both traffic lights using information obtained from the radar detector.
2. A traffic light system according to claim 1 in which the control unit is arranged to vary the duration of one or both of the red/amber phase and the amber phase in response to the signal from the or each radar sensor apparatus.
3. A traffic light system according to any preceding claim arranged to select a duration of the amber phase or red/amber phase that is shorter when an oncoming vehicle is not detected relative to the duration when an oncoming vehicle is detected.
4. A traffic light system according to any preceding claim in which the or each radar sensor apparatus in use detects the speed of a vehicle in a predetermined zone in front of the traffic light and the duration is varied by an amount that is as a function of the speed of any approaching vehicle detected by the or each radar sensor apparatus.
5. A traffic light system according to any preceding claim in which the or each radar sensor apparatus detects the position of the vehicle in a predetermined zone in front of the traffic light and the duration is varied by an amount that is as a function of the position of any approaching vehicle detected by the or each radar sensor apparatus.
6. A traffic light system according to any preceding claim in which the amber phase is set at a fixed value for use when vehicles are approaching, is reduced by 0.25 seconds when no vehicle is approaching.
7. A traffic light system according to claim 6 in which the amber phase is set at a duration of between 2.75 seconds and 3.25 seconds, being at or close to the lower end of the range when no approaching vehicle is detected and at or close to the upper end when an approaching vehicle is detected.
8. A traffic light system according to any preceding claim in which the red/amber is set at a fixed value for use when vehicles are approaching, and is reduced by approximately 0.25 seconds when no vehicle is approaching.
9. A traffic light system according to claim 8 in which the red/amber phase is set by the control unit to have a duration of between 1.75 seconds and 2.25 seconds, being at or close to the lower end of the range when no approaching vehicle is detected and at or close to the upper end when an approaching vehicle is detected.
10. A traffic light system according to any preceding claim in which the system includes two radar sensors, one detecting traffic approaching a first traffic light and the other detecting traffic approaching the second traffic light.
11. A method of controlling at least two traffic lights each traffic light comprising a green light, an amber light and a red light, the method comprising operating each of the lights in a synchronized pattern whereby each of the traffic lights is illuminated in a repeating sequence comprising: a green phase including illumination of the green light only, an amber phase including illumination of the amber light only, a red phase including illumination of the red light only, and then a red/amber phase including illumination of the amber light and red light only, the method being characterised by the further steps of detecting whether a vehicle is approaching one of the traffic lights and dynamically varying the duration of one or both of the red/amber phase and the amber phase for one or both traffic lights using information provided by a radar apparatus associated with the traffic light that is configured to detect oncoming traffic.
Intellectual
Property
Office
Application No: Claims searched:
GB 1800768.2 1-11
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GBGB1700815.2A GB201700815D0 (en) | 2017-01-17 | 2017-01-17 | A traffic light system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| GB201800768D0 GB201800768D0 (en) | 2018-02-28 |
| GB2560104A true GB2560104A (en) | 2018-08-29 |
Family
ID=58463327
Family Applications (2)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GBGB1700815.2A Ceased GB201700815D0 (en) | 2017-01-17 | 2017-01-17 | A traffic light system |
| GB1800768.2A Withdrawn GB2560104A (en) | 2017-01-17 | 2018-01-17 | A traffic light system |
Family Applications Before (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GBGB1700815.2A Ceased GB201700815D0 (en) | 2017-01-17 | 2017-01-17 | A traffic light system |
Country Status (1)
| Country | Link |
|---|---|
| GB (2) | GB201700815D0 (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109035781A (en) * | 2018-09-07 | 2018-12-18 | 江苏智通交通科技有限公司 | The multiple target traffic signals scheme optimization configuration method of demand is flowed to based on crossing |
| GB2605620A (en) * | 2021-04-07 | 2022-10-12 | First Call Traffic Man Ltd | Methods of installing traffic light poles and associated units |
| GB2618800A (en) * | 2022-05-17 | 2023-11-22 | Agd Systems Ltd | Temporary traffic control system |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB803916A (en) * | 1955-12-09 | 1958-11-05 | Automatic Telephone & Elect | Improvements in or relating to traffic control systems |
| CA2655457A1 (en) * | 2008-04-16 | 2009-10-16 | International Road Dynamics Inc. | Mid-block traffic detection and signal control |
| US20160027299A1 (en) * | 2014-07-28 | 2016-01-28 | Econolite Group, Inc. | Self-configuring traffic signal controller |
| CN104021683B (en) * | 2014-05-23 | 2016-03-30 | 河北工业大学 | An Adaptive Signal Timing Method for Intersection Yellow Light Capture |
-
2017
- 2017-01-17 GB GBGB1700815.2A patent/GB201700815D0/en not_active Ceased
-
2018
- 2018-01-17 GB GB1800768.2A patent/GB2560104A/en not_active Withdrawn
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB803916A (en) * | 1955-12-09 | 1958-11-05 | Automatic Telephone & Elect | Improvements in or relating to traffic control systems |
| CA2655457A1 (en) * | 2008-04-16 | 2009-10-16 | International Road Dynamics Inc. | Mid-block traffic detection and signal control |
| CN104021683B (en) * | 2014-05-23 | 2016-03-30 | 河北工业大学 | An Adaptive Signal Timing Method for Intersection Yellow Light Capture |
| US20160027299A1 (en) * | 2014-07-28 | 2016-01-28 | Econolite Group, Inc. | Self-configuring traffic signal controller |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109035781A (en) * | 2018-09-07 | 2018-12-18 | 江苏智通交通科技有限公司 | The multiple target traffic signals scheme optimization configuration method of demand is flowed to based on crossing |
| GB2605620A (en) * | 2021-04-07 | 2022-10-12 | First Call Traffic Man Ltd | Methods of installing traffic light poles and associated units |
| EP4071737A3 (en) * | 2021-04-07 | 2022-11-16 | First Call Traffic Management Ltd | Traffic light systems, moveable base units and associated methods |
| GB2618800A (en) * | 2022-05-17 | 2023-11-22 | Agd Systems Ltd | Temporary traffic control system |
| GB2618800B (en) * | 2022-05-17 | 2024-10-09 | Agd Systems Ltd | Temporary traffic control system |
Also Published As
| Publication number | Publication date |
|---|---|
| GB201800768D0 (en) | 2018-02-28 |
| GB201700815D0 (en) | 2017-03-01 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| KR101145955B1 (en) | Traffic calming system in the crosswalk and traffic calming method thereof | |
| KR101904762B1 (en) | Pedestrian traffic signal lamp having a signal for warning entrance of turn to right | |
| US9623793B2 (en) | Method for controlling a headlight system of a motor vehicle and controller and device for carrying out the method | |
| US10919436B2 (en) | Vehicle control system and column traveling system | |
| GB2560104A (en) | A traffic light system | |
| JP5429354B2 (en) | Vehicle control device | |
| KR102290649B1 (en) | Auxiliary traffic lights for vehicles to guide of entering crosswalks | |
| CN110415542B (en) | Safe speed control system and method for avoiding accidental running of yellow light by motor vehicle at road intersection | |
| KR20160092959A (en) | Method of preventing traffic accidents in crossroad for signal violation and overspeed, and system of the same | |
| KR20160092958A (en) | Method of preventing traffic accidents for signal violation in crossroad, and system of the same | |
| US20180257552A1 (en) | Vehicle comprising turn signal lights, and method for signaling a driving direction to following vehicles | |
| KR101542715B1 (en) | System for Warning Dangerous Road Section to a Driver and Inducing Speed Reduction from a Driver | |
| KR102516215B1 (en) | Artificial intelligent traffic light | |
| CN113990087B (en) | Signal control method for improving road traffic safety | |
| KR20180020201A (en) | Apparatus and Method for Controlling Driving Speed using Sequential On-and-Off Lighting | |
| JP7151185B2 (en) | vehicle controller | |
| CN102800204A (en) | Solar induction-type crossroad caution light | |
| KR101756034B1 (en) | Adaptive Tail Light | |
| KR101813354B1 (en) | Device for preventing accidents caused by rear-end collisions and operating system thereof | |
| KR100402908B1 (en) | Door type interception System for a railway crossing | |
| KR20170002948A (en) | reduction of speed measurement | |
| KR20190054262A (en) | Apparatus and method for inducing head lamp turn-on of rear vehicle | |
| JP2560958Y2 (en) | Gaze guidance device | |
| GB2594540A (en) | Traffic signalling apparatus | |
| KR102272398B1 (en) | Traffic light and signal method using the same |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| WAP | Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1) |