WO2002035496A1 - Traffic signalling - Google Patents

Traffic signalling Download PDF

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Publication number
WO2002035496A1
WO2002035496A1 PCT/SE2001/002336 SE0102336W WO0235496A1 WO 2002035496 A1 WO2002035496 A1 WO 2002035496A1 SE 0102336 W SE0102336 W SE 0102336W WO 0235496 A1 WO0235496 A1 WO 0235496A1
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WO
WIPO (PCT)
Prior art keywords
signals
light
signal
module
radio
Prior art date
Application number
PCT/SE2001/002336
Other languages
French (fr)
Inventor
Lars Andersson
Original Assignee
Lars Andersson
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Lars Andersson filed Critical Lars Andersson
Priority to AU2002211150A priority Critical patent/AU2002211150A1/en
Publication of WO2002035496A1 publication Critical patent/WO2002035496A1/en

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Classifications

    • G—PHYSICS
    • G08—SIGNALLING
    • G08G—TRAFFIC CONTROL SYSTEMS
    • G08G1/00—Traffic control systems for road vehicles
    • G08G1/09—Arrangements for giving variable traffic instructions
    • G08G1/095—Traffic lights
    • G08G1/0955—Traffic lights transportable
    • G—PHYSICS
    • G08—SIGNALLING
    • G08G—TRAFFIC CONTROL SYSTEMS
    • G08G1/00—Traffic control systems for road vehicles
    • G08G1/07—Controlling traffic signals
    • G08G1/087—Override of traffic control, e.g. by signal transmitted by an emergency vehicle

Definitions

  • the present invention relates to a system for the control of a traffic light system, especially for control of alternative traffic lights by means of radio frequency signals.
  • FIG. 1 shows an existing traffic light system 100 at a road intersection 102.
  • the traffic light system comprises several traffic lights 104 in different directions, i.e. several poles 106 provided with signal lamps 108.
  • One pole can be provided with several signal lamps in different directions.
  • the signal lamp has light signals 110 capable of displaying red/yellow/green light or red/green light or yellow/green light etc.
  • Several signal lamps regulating the traffic in a certain direction jointly form a signal group. In cases where poles cannot be used, the signal lamps can be attached for example on a road sign crossing over the traffic lane to be regulated.
  • the traffic light system includes a control device 112, determining when a certain signal group is to display a red/yellow/green light.
  • the control device In order not to cause any traffic accidents if something goes wrong in a traffic light or in its cables, the control device continuously detects that the correct light signal shines in the correct position in the intersection. In the case of a short- circuit, a green light is not allowed to be displayed in two intersecting lanes simultaneously. This is continuously detected by the control device by measuring the power consumption in each signal group and comparing with a control value. In the case of e.g. a red light signal being out of function in a signal group, the control device detects a decrease in power consumption in this signal group, wherein the control device is programmed to shut down the entire traffic light .
  • Radio-controlled signal lamps have existed long since, but only in connection with a specific transmitting control system and then often as a shuttle signal. This is described in the British patent GB 1 538 288, of M. R. Hutchinson, title “Improvements relating to traffic light control system". In this patent, a shuttle system is described, provided with two traffic lights affecting each other by a first signal lamp controlling a second signal lamp by means of radio signals .
  • the present invention relates to a traffic light system.
  • Features and characteristics of the invention will be evident from the enclosed patent claims.
  • radio modules can be used as links for wireless communication between the control device and an alternative traffic light.
  • the radio modules operate in groups, including a first radio module, called a main module, and at least one second module, called a slave module.
  • the main module is connected to the control device or to a connected pole with or without a signal lamp.
  • the slave module can be mounted in the alternative traffic light or in a slave signal lamp to be mounted anywhere, in a movable pole or in a permanent pole belonging to the regular traffic light.
  • the slave module may be connected to existing power supply or to a battery.
  • main- and slave modules can be installed in the traffic light system, together with push buttons for regulating the traffic lights and/or detectors for detecting the vehicles.
  • One advantage with the present invention is that temporary rearrangements of poles provided with signal lamps can be made faster and easier at road works where the traffic lights are to be maintained in operation.
  • Another advantage with the present invention is that a traffic light can be put faster into operation when the original signal lamp has gone out due to cable breakdown, or the like.
  • a traffic light can be put faster into operation when the original signal lamp has gone out due to cable breakdown, or the like.
  • a mul i -conductor cable for example, is broken in the road, some of the conductors may be intact and possible to use for supplying power, a phase and a zero, whereby the alternative traffic light can be promptly put in operation.
  • Another advantage with the present invention is that the traffic light system can be in operation while the damaged cables are localized, digged up and repaired.
  • a further advantage is achieved in the case when a pole is hit by a vehicle in the winter. In winter, it takes approximately 24 hours to thaw the ground in order to repair a pole and cables. In that case, a temporary pole provided with battery operated radio modules can be used, whereby the traffic light system can be in operation in the meantime.
  • Fig. 1 shows a traffic light system in an intersection.
  • Fig. 2 shows an example of the invented traffic light system
  • Fig. 3 shows an example of a signalling diagram for the invented traffic light system.
  • FIG. 2 shows a part of the traffic light system according to figure 1.
  • figure 2 shows a regular traffic light 104 and one alternative traffic light 228.
  • a first radio module called a main module
  • the main module 206 is installed in a signal lamp 108, which is indicated by dotted lines.
  • the regular traffic light 104 comprises the signal lamp 108 and a thereto belonging pole 106, in which the light signals 110 are connected to the main module 206.
  • the main transceiver 210 is located, connected to an antenna 218.
  • the main module 206 can be connected directly to the control device 112 or may be connected anywhere to existing, connected signal groups .
  • the alternative traffic light 228 comprises a slave signal lamp 202 and a pole 106 belonging to the lamp, and alternative light signals 226 displaying the same light as the regular, replaced traffic light 104.
  • a second radio module 204 called a slave module, is connected to the slave signal lamp 202.
  • a slave transceiver 212 is located, connected to an antenna 218.
  • An actuating device 224 may also be connected to the slave module. This actuating device 224 may for example comprise a button for pedestrians, or a sensing device located in the road for cars, or in the pavement for mopeds/bicycles .
  • This actuating device 224 is connected to the slave module 204, as well.
  • a sensing device 220 is provided, e.g. a light sensitive component, which is connected to the slave control unit 214, sensing whether the red/yellow/green light is turned on.
  • the slave module 204 can be connected to a slave signal lamp 202, which then can be placed where the traffic light is needed the most.
  • a dotted line indicates that the slave module 204 is installed in the slave signal lamp 202.
  • Figure 3 shows an example of a signalling diagram between the control device 112, the main module 206, the slave module 204 and the alternative light signals 226 in the traffic light system 100.
  • the alternative light signal initially displays a yellow light in the slave signal lamp 202.
  • the control device 112 issues a signal 302 "red phase” in the main module 206.
  • a main control unit 208, figure 2 transforms the signal 302, denoted “red phase”, to a signal 304, denoted “coded red signal”, transmits radio signals R, figure 2, by the main transceiver 210 through an antenna 218 located in the main module 206, figure 2, to the slave module 204.
  • the signal 304 "coded red signal” is received by an antenna 218 in the slave module 204, figure 2, and arrives at the slave transceiver 212 which decodes the signal 304, "coded red signal” in a slave control unit 214, figure 2.
  • the slave control unit 214 transmits a signal 318, denoted "yellow signal”, having a status "TURN OFF", which turns the yellow light signal off by deactivating the yellow output in a group on a switch 216 in the slave module 204, figure 2. Further, the slave control unit 214 transmits a signal 306, denoted “red signal”, having the status "TURN ON", resulting in the red light signal being turned on. The light sensitive component 220 for red light senses whether the red light signal 226 is turned on. A signal 308, denoted "light status” and having the status "TURN ON", is transmitted to the slave control unit 214.
  • the slave control unit 214 transforms the signal 308 "light status” into a coded signal 310 "sensor signal”, having the status "ON” (switched on) , which is transmitted by the slave transceiver 212 through the antenna 218 in the slave module 204 to the main module 206.
  • a coded signal 310, "sensor signal”, having the status "ON”, is received by the antenna 218 on the main module 206 and transported to the main transceiver 210.
  • the signal 310, “sensor signal”, having the status "ON” (switched on) is decoded in the main control unit 210 and activates a switch 222 in the phase 312, "red phase", turning into "ON”
  • the traffic light system 100 In the case when no red light is shining, or if the red light signal is turned off, the traffic light system 100 is closed.
  • the signal 308 "light status" is forwarded to the slave module 204 in the slave signal lamp 202, which in turn indicates that the signal 310 "sensor signal” is off, having the status "OFF"
  • the main module 206 and the slave module loses contact with one another.
  • the light signal 226 is immediately turned off by the signal 306, "red signal”, having the status "TURN OFF”.
  • the phase 312 "red phase” is reached, having the status "OFF” (switched off) , resulting in that the output of the red group on the switch 222 is deactivated, which in the control device 112 is perceived as if the red light has gone out.
  • the slave module 204 can be operated either by means of a battery or electricity.
  • the slave module 204 having the slave signal lamp 202, replaces the pole having the signal lamp, which is out of function or has to be moved.
  • figure 3 shows the slave module 204 as connected to an actuating device 224, influenced by external conditions, such as e.g. a pedestrian pushing a button or a vehicle passing a sensing device in the road.
  • the actuating device 224 transmits a signal 320 "change state" to the slave unit 206 in order to change the color of the light signal 226, for example from red light signal to green light signal.
  • the slave module 204 transmits, similarly as described above regarding the signal 310, a signal 322 "coded change state" to the main module 206.
  • the main module 206 transmits, similarly as described above regarding signal 312, a signal 324 "change state/phase" to the control device 212.
  • Subsequent steps comprise sending a signal in order to change a light signal 226 according to the above-described example.
  • the actuating device 224 is provided with its own transceiver, which is capable of communicating with the main module according to a signalling pattern similar to the above.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Business, Economics & Management (AREA)
  • Emergency Management (AREA)
  • Traffic Control Systems (AREA)

Abstract

A system for control of traffic lights (104) in a traffic light system (100). The system is intended to control alternative light signals (228) when a regular traffic light (104) is out of function, by in a simple way plugging in main- and slave modules (206, 204). After that, the alternative traffic light is controlled by means of control signals from a control device (112) by means of radio signals between the main module (206) and the slave module (204) and the thereto-belonging alternative traffic light. The traffic light system comprises: at least one signal lamp (108) provided with light signals (110) controlled by the control device, the main module being connected directly/iindirectly to the control device and the slave module being connected to a slave signal lamp (202), which in turn is connected to the alternative light signals (226). The slave module can also be connected to an actuating device (224). These modules communicate with each other by means of radio signals. Every module includes an antenna (218), a switch (222, 216), a control unit (208), 214) and a transceiver (210, 212).

Description

Traffic signalling
TECHNICAL FIELD
The present invention relates to a system for the control of a traffic light system, especially for control of alternative traffic lights by means of radio frequency signals.
BACKGROUND OF THE INVENTION
At road constructions and diversions of traffic routes, temporary displacements of traffic lights often occur, when they need to be moved in order to be in operation. Displacements of traffic lights are both tedious and time consuming, since correct conductors/cables must be drawn to the temporary location of a traffic light. It is expensive and tedious to dig down the correct cables, or to suspend them up in the air.
Figure 1 shows an existing traffic light system 100 at a road intersection 102. The traffic light system comprises several traffic lights 104 in different directions, i.e. several poles 106 provided with signal lamps 108. One pole can be provided with several signal lamps in different directions. The signal lamp has light signals 110 capable of displaying red/yellow/green light or red/green light or yellow/green light etc. Several signal lamps regulating the traffic in a certain direction jointly form a signal group. In cases where poles cannot be used, the signal lamps can be attached for example on a road sign crossing over the traffic lane to be regulated.
The traffic light system includes a control device 112, determining when a certain signal group is to display a red/yellow/green light.
In order not to cause any traffic accidents if something goes wrong in a traffic light or in its cables, the control device continuously detects that the correct light signal shines in the correct position in the intersection. In the case of a short- circuit, a green light is not allowed to be displayed in two intersecting lanes simultaneously. This is continuously detected by the control device by measuring the power consumption in each signal group and comparing with a control value. In the case of e.g. a red light signal being out of function in a signal group, the control device detects a decrease in power consumption in this signal group, wherein the control device is programmed to shut down the entire traffic light .
Temporary displacements and repairs can be considerably simplified by means of a radio-controlled module connected to the signal lamps. Radio-controlled signal lamps have existed long since, but only in connection with a specific transmitting control system and then often as a shuttle signal. This is described in the British patent GB 1 538 288, of M. R. Hutchinson, title "Improvements relating to traffic light control system". In this patent, a shuttle system is described, provided with two traffic lights affecting each other by a first signal lamp controlling a second signal lamp by means of radio signals .
DESCRIPTION OF THE INVENTION
The present invention relates to a traffic light system. Features and characteristics of the invention will be evident from the enclosed patent claims.
In the case when a regular traffic light for some reason must be replaced, radio modules can be used as links for wireless communication between the control device and an alternative traffic light. The radio modules operate in groups, including a first radio module, called a main module, and at least one second module, called a slave module. The main module is connected to the control device or to a connected pole with or without a signal lamp. The slave module can be mounted in the alternative traffic light or in a slave signal lamp to be mounted anywhere, in a movable pole or in a permanent pole belonging to the regular traffic light. The slave module may be connected to existing power supply or to a battery.
Further main- and slave modules can be installed in the traffic light system, together with push buttons for regulating the traffic lights and/or detectors for detecting the vehicles.
One advantage with the present invention is that temporary rearrangements of poles provided with signal lamps can be made faster and easier at road works where the traffic lights are to be maintained in operation.
Another advantage with the present invention is that a traffic light can be put faster into operation when the original signal lamp has gone out due to cable breakdown, or the like. When a mul i -conductor cable, for example, is broken in the road, some of the conductors may be intact and possible to use for supplying power, a phase and a zero, whereby the alternative traffic light can be promptly put in operation.
Another advantage with the present invention is that the traffic light system can be in operation while the damaged cables are localized, digged up and repaired.
A further advantage is achieved in the case when a pole is hit by a vehicle in the winter. In winter, it takes approximately 24 hours to thaw the ground in order to repair a pole and cables. In that case, a temporary pole provided with battery operated radio modules can be used, whereby the traffic light system can be in operation in the meantime.
DESCRIPTION OF THE DRAWINGS The invention will now be described with reference to the enclosed drawings .
Fig. 1 shows a traffic light system in an intersection. Fig. 2 shows an example of the invented traffic light system, and Fig. 3 shows an example of a signalling diagram for the invented traffic light system.
PREFERRED EMBODIMENT
Figure 2 shows a part of the traffic light system according to figure 1. Thus, figure 2 shows a regular traffic light 104 and one alternative traffic light 228. According to this embodiment, a first radio module, called a main module, is connected to the regular traffic light 104. The main module 206 is installed in a signal lamp 108, which is indicated by dotted lines. The regular traffic light 104 comprises the signal lamp 108 and a thereto belonging pole 106, in which the light signals 110 are connected to the main module 206. In the main module 206 the main transceiver 210 is located, connected to an antenna 218.
The main module 206 can be connected directly to the control device 112 or may be connected anywhere to existing, connected signal groups .
The alternative traffic light 228 comprises a slave signal lamp 202 and a pole 106 belonging to the lamp, and alternative light signals 226 displaying the same light as the regular, replaced traffic light 104. A second radio module 204, called a slave module, is connected to the slave signal lamp 202. In the slave module 204 a slave transceiver 212 is located, connected to an antenna 218. An actuating device 224 may also be connected to the slave module. This actuating device 224 may for example comprise a button for pedestrians, or a sensing device located in the road for cars, or in the pavement for mopeds/bicycles .
This actuating device 224 is connected to the slave module 204, as well. For every light aperture or shadow shield on the slave signal lamp 202, a sensing device 220 is provided, e.g. a light sensitive component, which is connected to the slave control unit 214, sensing whether the red/yellow/green light is turned on. The slave module 204 can be connected to a slave signal lamp 202, which then can be placed where the traffic light is needed the most. In this figure, a dotted line indicates that the slave module 204 is installed in the slave signal lamp 202.
Figure 3 shows an example of a signalling diagram between the control device 112, the main module 206, the slave module 204 and the alternative light signals 226 in the traffic light system 100.
One example of signalling is described below, in which a shift from displaying yellow light to displaying a red light of the alternative light signals 226 is performed. This works in a corresponding way in other changes of condition, in other words at colour changes in the alternative light signals 226 of the traffic light system.
The alternative light signal initially displays a yellow light in the slave signal lamp 202. The control device 112 issues a signal 302 "red phase" in the main module 206. A main control unit 208, figure 2, transforms the signal 302, denoted "red phase", to a signal 304, denoted "coded red signal", transmits radio signals R, figure 2, by the main transceiver 210 through an antenna 218 located in the main module 206, figure 2, to the slave module 204. The signal 304 "coded red signal" is received by an antenna 218 in the slave module 204, figure 2, and arrives at the slave transceiver 212 which decodes the signal 304, "coded red signal" in a slave control unit 214, figure 2. The slave control unit 214 transmits a signal 318, denoted "yellow signal", having a status "TURN OFF", which turns the yellow light signal off by deactivating the yellow output in a group on a switch 216 in the slave module 204, figure 2. Further, the slave control unit 214 transmits a signal 306, denoted "red signal", having the status "TURN ON", resulting in the red light signal being turned on. The light sensitive component 220 for red light senses whether the red light signal 226 is turned on. A signal 308, denoted "light status" and having the status "TURN ON", is transmitted to the slave control unit 214. Then, the slave control unit 214 transforms the signal 308 "light status" into a coded signal 310 "sensor signal", having the status "ON" (switched on) , which is transmitted by the slave transceiver 212 through the antenna 218 in the slave module 204 to the main module 206. A coded signal 310, "sensor signal", having the status "ON", is received by the antenna 218 on the main module 206 and transported to the main transceiver 210. After that, the signal 310, "sensor signal", having the status "ON" (switched on) is decoded in the main control unit 210 and activates a switch 222 in the phase 312, "red phase", turning into "ON"
(switched on) . This means that the red output of the group is activated/loaded, resulting in that the control device 112 perceives this as a lamp being connected by a cable to the control device 112. The sensing procedure, to sense whether a red light signal is shining, is repeated several times each second.
In the case when no red light is shining, or if the red light signal is turned off, the traffic light system 100 is closed.
This can take place by the signal 308, "light status", having the status "TURNED OFF", which means that the light sensitive component 220 does not sense the red light signal 226. The signal 308 "light status" is forwarded to the slave module 204 in the slave signal lamp 202, which in turn indicates that the signal 310 "sensor signal" is off, having the status "OFF"
(switched off), to the main module 206. Then, the switch 222 is deactivated in the phase 312, "red phase", into "OFF" (switched off) . This results in the output of the red group not being activated, indicating that something has happened with the traffic lights.
It may occur that the main module 206 and the slave module loses contact with one another. In this case, the light signal 226 is immediately turned off by the signal 306, "red signal", having the status "TURN OFF". At the same time, in the main module 206, the phase 312 "red phase" is reached, having the status "OFF" (switched off) , resulting in that the output of the red group on the switch 222 is deactivated, which in the control device 112 is perceived as if the red light has gone out.
The signals described above are only exemplary for how different alternative light signals may be arranged.
Further signal switching, e.g. from red to yellow, yellow to green, and so on, can take place accordingly, although with yellow and green signals.
The slave module 204 can be operated either by means of a battery or electricity. Thus, the slave module 204, having the slave signal lamp 202, replaces the pole having the signal lamp, which is out of function or has to be moved.
Thereafter, figure 3 shows the slave module 204 as connected to an actuating device 224, influenced by external conditions, such as e.g. a pedestrian pushing a button or a vehicle passing a sensing device in the road. The actuating device 224 transmits a signal 320 "change state" to the slave unit 206 in order to change the color of the light signal 226, for example from red light signal to green light signal. The slave module 204 transmits, similarly as described above regarding the signal 310, a signal 322 "coded change state" to the main module 206. Then, the main module 206 transmits, similarly as described above regarding signal 312, a signal 324 "change state/phase" to the control device 212. Subsequent steps comprise sending a signal in order to change a light signal 226 according to the above-described example.
In an alternative embodiment, the actuating device 224 is provided with its own transceiver, which is capable of communicating with the main module according to a signalling pattern similar to the above.
The present invention is, of course, not limited to the embodiments described above, but may be modified within the scope of the appended patent claims.

Claims

PATENT CLAIMS
1. Traffic light system (100) for the control of light signals, the traffic light system including a control device (112) arranged to control the light signals, characterized by the traffic light system comprising:
- radio modules (206, 204) arranged to transmit and receive radio frequency signals, and
- alternative light signals (226) arranged to be controlled by the control device (112) , the control device being connected to the alternative light signals by means of the radio modules (206, 204) .
2. Traffic light system according to claim 1, characterized by: a first radio module (206) connected to the control device
(112), the control device being arranged to transmit and receive signals to/from the first radio module; at least one second radio module (204) connected to the first radio module by means of radio signals, the first radio module being arranged to transmit radio signals to the second radio module; the first radio module arranged to receive radio signals from the second radio module; wherein the alternative light signals (226) are connected to the second radio module (204) , the second module being arranged to control the alternative light signals by means of the first radio module (206) from the control device (112), wherein the second radio module is arranged to transmit signals and status information for the alternative light signals by means of the first radio module to the control device.
3. Traffic light system according to claim 1 or 2 , characterized in that the radio modules (206, 204) comprise transceivers (210, 212) in order to transmit and receive signals.
4. Traffic light system according to any of claims 1-3, characterized in that each of the radio modules comprises a main control unit (208, 214), the main control units being arranged to code and decode signals, respectively, which are transmitted and received.
5. Traffic light system according to any of the claims 2-4, characterized in that at least one sensing device (220) is located in the vicinity of one of the alternative light signals, the sensing device being connected to the second radio module, wherein the sensing device is arranged to detect whether a certain alternative light signal is switched on/switched off.
6. Traffic light system according to any of claims 2-5, the traffic light system comprising at least one actuating device
(224) for controlling a light signal, the actuating device being arranged to be influenced by somebody pushing a button or a vehicle passing a sensing device in the road, characterized in that the actuating device is connected with the second radio module (204) , the actuating device being arranged to change a status of the light signals.
PCT/SE2001/002336 2000-10-27 2001-10-25 Traffic signalling WO2002035496A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU2002211150A AU2002211150A1 (en) 2000-10-27 2001-10-25 Traffic signalling

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE0003924 2000-10-27
SE0003924A SE517523C2 (en) 2000-10-27 2000-10-27 A system for controlling a traffic signal system

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Publication Number Publication Date
WO2002035496A1 true WO2002035496A1 (en) 2002-05-02

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Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1830332A2 (en) * 2006-03-04 2007-09-05 Hatton Traffic Management Limited Traffic light control system
CN102436752A (en) * 2011-09-29 2012-05-02 青岛海信网络科技股份有限公司 Prior control system and method for road signals
EP2490197A1 (en) * 2009-08-03 2012-08-22 Hatton Traffic Management Ltd Traffic control system
CN103218920A (en) * 2012-09-15 2013-07-24 海宁伊满阁太阳能科技有限公司 Generalized intelligent signal lamp control system
CN103218917A (en) * 2012-09-15 2013-07-24 海宁伊满阁太阳能科技有限公司 Digital wireless broadcast traffic signal lamp set
CN104751658A (en) * 2014-07-15 2015-07-01 卢满松 Hidden-type mobile traffic signal command device
CN105465703A (en) * 2014-09-29 2016-04-06 韦尔马控股有限及两合公司 Optical signaling device
CN105931476A (en) * 2016-07-02 2016-09-07 冯国铮 Standby traffic signal lamp apparatus capable of being automatically started during power failure
CN109472987A (en) * 2018-11-13 2019-03-15 唐文俊 A kind of Multifunctional traffic signal lamp and its method

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1995020206A1 (en) * 1994-01-19 1995-07-27 Armstrong Charles V Traffic control device
US5900826A (en) * 1996-11-27 1999-05-04 Farber; Gary J. Remote controlled portable traffic signals

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1995020206A1 (en) * 1994-01-19 1995-07-27 Armstrong Charles V Traffic control device
US5900826A (en) * 1996-11-27 1999-05-04 Farber; Gary J. Remote controlled portable traffic signals

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1830332A2 (en) * 2006-03-04 2007-09-05 Hatton Traffic Management Limited Traffic light control system
EP1830332A3 (en) * 2006-03-04 2008-06-04 Hatton Traffic Management Limited Traffic light control system
GB2435708B (en) * 2006-03-04 2010-07-21 Hatton Traffic Man Ltd Traffic light control system
EP2490197A1 (en) * 2009-08-03 2012-08-22 Hatton Traffic Management Ltd Traffic control system
CN102436752A (en) * 2011-09-29 2012-05-02 青岛海信网络科技股份有限公司 Prior control system and method for road signals
CN103218920A (en) * 2012-09-15 2013-07-24 海宁伊满阁太阳能科技有限公司 Generalized intelligent signal lamp control system
CN103218917A (en) * 2012-09-15 2013-07-24 海宁伊满阁太阳能科技有限公司 Digital wireless broadcast traffic signal lamp set
CN104751658A (en) * 2014-07-15 2015-07-01 卢满松 Hidden-type mobile traffic signal command device
CN105465703A (en) * 2014-09-29 2016-04-06 韦尔马控股有限及两合公司 Optical signaling device
CN105465703B (en) * 2014-09-29 2022-03-04 韦尔马控股有限及两合公司 Optical signalling device
CN105931476A (en) * 2016-07-02 2016-09-07 冯国铮 Standby traffic signal lamp apparatus capable of being automatically started during power failure
CN109472987A (en) * 2018-11-13 2019-03-15 唐文俊 A kind of Multifunctional traffic signal lamp and its method

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Publication number Publication date
SE0003924L (en) 2002-04-28
SE517523C2 (en) 2002-06-11
SE0003924D0 (en) 2000-10-27
AU2002211150A1 (en) 2002-05-06

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