US3872422A - Street traffic signalling system - Google Patents

Street traffic signalling system Download PDF

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Publication number
US3872422A
US3872422A US369725A US36972573A US3872422A US 3872422 A US3872422 A US 3872422A US 369725 A US369725 A US 369725A US 36972573 A US36972573 A US 36972573A US 3872422 A US3872422 A US 3872422A
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United States
Prior art keywords
timing generator
signal
intersection
main station
impulse
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.)
Expired - Lifetime
Application number
US369725A
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English (en)
Inventor
Anton Obermaier
Peter Drebinger
Johann Hoisl
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Siemens AG
Siemens Corp
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Siemens Corp
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Filing date
Publication date
Priority claimed from DE19722229284 external-priority patent/DE2229284C3/de
Application filed by Siemens Corp filed Critical Siemens Corp
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Publication of US3872422A publication Critical patent/US3872422A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • G—PHYSICS
    • G08—SIGNALLING
    • G08G—TRAFFIC CONTROL SYSTEMS
    • G08G1/00—Traffic control systems for road vehicles
    • G08G1/07—Controlling traffic signals
    • G08G1/081—Plural intersections under common control

Definitions

  • the invention is directed to a street traffic signalling system in which the signal light units for each traffic flow at an intersection are to be independently regulated by a central programmer with the signal unit for each traffic flow being controlled from an individual control channel by means of an actuating switch cooperable with time switches which can be triggered thereby and are in the form of impulse counters.
  • the invention is directed to the problem of efficiently combining these two requirements whereby the entire traffic operations of an intersection may be centrally programmed and determined with as few as possible transmission means between the intersection and the computer programmer in the main station, at the same time avoiding any possible dangerous traffic conditions which might arise by the utilization of fast reacting test devices.
  • a street traffic signalling system employing a central programmer at the main station in which the signal light units for each traffic flow at the intersection involved, which must be independently adjusted, are respectively controlled over one individual control channel in cooperation with an actuating switch and timing switches triggerable thereby, and which may be in the form of impulse counters, which such impulse counters also being under the control of a local timing generator common to all of those at such intersection, and which timing generator can be synchronized from the main station by means of a synchronizing impulse at predetermined selected time intervals as for example once per programmed signalling cycle, with the impulses of the timing generator being sufficiently phaseshifted at the initiation of a change order signal from the main station, with such time delay preventing the undesired operation in the test device.
  • the synchronizing impulse from the main station can be transmitted to the intersection over a special control channel", or such synchronizing impulse can be derived at the intersection from the impulse flank of a signalchanging order from the main station.
  • FIG. 1 is a diagram illustrating a simple traffic intersection with the traftic flows involved and associated signal units for the control thereof;
  • FIG. 2 is a circuit arrangement including a central programmer in the main station and a signal light unit or assembly at an intersection;
  • FIG. 3 is a time chart for the signal units regulating the intersection in accordance with FIG. 1;
  • FIG. 4 is a circuit diagram of a control device associated with each of the signal units
  • FIG. 5 is a table illustrating various related states of certain components of the circuit of FIG. 4;
  • FIG. 6 is a circuit diagram of a control device for pedestrian signal units
  • FIG. 7 is a circuit diagram of a timing generator for use in the circuit of FIG. 2;
  • FIG. 8 is a time chart in connection with the operation of the timing generator of FIG. 7;
  • FIG. 9 is a circuit diagram of a test device for monitoring the signalling operations.
  • control devices Stl to 8:4 are provided for the respective vehicle signal units Sgl through Sg4 and control devices szll throughstl4 are provided for the pedestrian signal generators sgll through sgl4 (For simplicity and to avoid mere duplication, signal unit sg2, sgll and sglZ have been omitted from the drawing).
  • All component elements illustrated in FIG. 2 are designated by referencecharacters comprising two letters, while component elements in the individual devices SI, st, Tg, Pe, etc., are designated by reference characters comprising one letter.
  • the control devices St or st can be controlled in conjunction with a common timing generator Tg at the intersection Kr by the programmer Pg in the main station Ze, Pa control channel F1.
  • the programmer pg is represented symbolically in FIG. 2 by a rotary selector Dr and information contact Inf. This is intended to .broadly depict the actuating switches Scl through usually employed with computers which can be in the form of intermediate memories, such'as the buffer memorySp.
  • Section 0. discloses that the switches 801 through Sc4 or Scll through S014 only switches Scl, Sc3, S04, Sc13, and S014 being illustrated in the figure.) are actuated sequentially within a time period between and 1 second, and thus the actuation of the control devices Stl through st14 are actuated with a corresponding phase shift. Consequently, if the second impulse from the timing generator Tg were emitted when all orderdesignating signals had been transmitted for the desired signal change in this period between 0 and 1 second,
  • the orders possibly all control devices Stl throughsll4 would be simultaneously switched and thus also the signal units Sgl through sg14 (comparesection b of FIG. 3).
  • the individual signal conditions red, red/yellow and green for the signal units Sgl through sg14 are presented in section 0 of FIG. 3 in which the representative time period is correspondingly changed to provide a better illustration.
  • the phase shifting of the timing impulses with respect to the order-designating signals is achieved by timing meansin the timing generator Tg which allows a minimum time of 500 milliseconds to occur between the sychronizing impulse from the switch 500 and the timing impulses.
  • FIG. 3 also illustrates how an order-designating signal, for example, that for the signal generator Sgl can also be employed as a synchronizing impulse.
  • an order-designating signal for example, that for the signal generator Sgl can also be employed as a synchronizing impulse.
  • FIG. 4 illustrates the construction of the control devices St for the individual vehicle signal units Sg. Assuming that no voltage is applied at the input q thereof, the flip-flop Kl will be in rest position over its inverted input, as indicated by the clot. The flip-flop K2 likewise will be in rest position. A voltage thus will appear at their outputs al, and the red lamp in the signal unit Sg will be illuminated.
  • a voltage will therefore appear at the output K2 thereof which will be conducted over Nand gates G9, G10, and additional power switches, not illustrated, to extinguish the red and yellow lamps in the signal unit Sg and illuminate the green lamp.
  • the counter Hui Hui
  • bsle s 9v, nPPt If the voltage at the input q ceases, as a result of it being cut off at the main station Ze upon receipt of the second timing impulse from the input u, flip-flop Kl will return to its rest condition. This will result in a cutting off of the actuation of the green lamp over the Nand gates G9, G10, while Nand gates GI through G4 will result in illumination on the yellow lamp without actuation of any further means.
  • the reset input R of the counter 21 is released and after a given time period, for example, 4 seconds, the flip-flop K2 will be returned to its rest position over Nand gates G7, G8, cooperably with the second impulseat the input u.
  • the control device St is also provided with two Nand gates G11, G12 whereby a voltage will always appear at the output v when only the red lamp is illuminated in the signal unit Sg.
  • FIG. 5 illustrates the conditions at various components of the control circuit as well as illuminating conditions of the red, yellow and green lamps in the signal salt 8- V 1
  • FIG. 6 illustrates a simple control switch st for the pedestrian signal sg. If no voltage is present at the input q, the flip-flop K3 will be in its rest position and the red lamp will be illuminated in the signal unit sg. However, if a voltage is applied to the input q from the main station Ze, upon receipt of the next following impulse from the timing generator Tg, the flip-flop K3 willbe flipped into its operational position, and the green lamp in the signal unit sg will be illuminated. Likewise, a voltage will appear at the output v only when the red lamp is illuminated. I
  • FIG. 7 illustrates a circuit for the common timing generator Tg for the intersection Kr.
  • no voltage is at the input w, so that flip-flops K4 and K5 are in operational position as the input e2 of the flip-flop K4 is inverted, as indicated by the dot.
  • Alternating voltage of 50 Hz frequency is present at the input .r and timing generator T thus will apply a frequency of 100 Hz of the flip-flops K4, K5 and the counters Z3, 24.
  • the latter are adapted to function as frequency dividers and respectively emit onc impulse per second over Bland gates G15, G16 to the output y.
  • FIG. 9 illustrates the construction of the test device Pe in which the individual outputs vl-through v14 of the control devices St or st, illustrated in FIG. 2, have been interlinked in a predetermined logic over Nand gates G17, G18, G19 and the Or gates 01, 02.
  • a street traffic signalling system in which the signal light units for the traffic flow in each direction at an intersection are independently regulated under the control of a central programmer at a main station with the signal unit for each such traffic flow being controlled over a respective individual channel, the combination of an actuating switch, controlled by said programmer, for each channel at such main station, operative to transmit order signals to the associated unit, time switches, for the respective units, in the form of impulse counters adapted to be triggered in response to an order signal resulting from actuation of the cooperable actuating switch, a timing generator connected in common to the respective impulse counters of an intersection for supplying impulses thereto, said timing generator being connected to receive synchronizing impulses, from the main station, at selected time intervals, whereby such generator is periodically synchronized, for example, once per signalling cycle, said timing generator including means for effecting a phase-shifting of the timing impulses upon the initiation of an order signal from the main station, for preventing improper operation of the system and false indications in a test device.
  • a street traffic signalling system according to claim 1, wherein there is provided an additional individual channel over which said synchronizing impulses are transmitted to said timing generator.
  • a street traffic signalling system wherein said timing generator is connected to be responsive to the leading edge of an order signal as the synchronizing impulse.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Traffic Control Systems (AREA)
  • Circuit Arrangement For Electric Light Sources In General (AREA)
US369725A 1972-06-15 1973-06-13 Street traffic signalling system Expired - Lifetime US3872422A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19722229284 DE2229284C3 (de) 1972-06-15 Straßenverkehrssignalanlage

Publications (1)

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US3872422A true US3872422A (en) 1975-03-18

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US369725A Expired - Lifetime US3872422A (en) 1972-06-15 1973-06-13 Street traffic signalling system

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US (1) US3872422A (OSRAM)
CH (1) CH558966A (OSRAM)
NL (1) NL7307755A (OSRAM)
NO (1) NO135492C (OSRAM)
SE (1) SE392536B (OSRAM)

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1992018961A1 (en) * 1991-04-15 1992-10-29 Hau Dan Chau Road and traffic control system
US5164904A (en) * 1990-07-26 1992-11-17 Farradyne Systems, Inc. In-vehicle traffic congestion information system
US5173691A (en) * 1990-07-26 1992-12-22 Farradyne Systems, Inc. Data fusion process for an in-vehicle traffic congestion information system
US5182555A (en) * 1990-07-26 1993-01-26 Farradyne Systems, Inc. Cell messaging process for an in-vehicle traffic congestion information system
US20050248469A1 (en) * 1999-04-19 2005-11-10 Dekock Bruce W System for providing traffic information
US20060074546A1 (en) * 1999-04-19 2006-04-06 Dekock Bruce W System for providing traffic information
US20090185856A1 (en) * 2006-03-17 2009-07-23 Young Dae Kim Hexagonal roadway system and traffic control system thereof
US7908080B2 (en) 2004-12-31 2011-03-15 Google Inc. Transportation routing
US9349288B2 (en) 2014-07-28 2016-05-24 Econolite Group, Inc. Self-configuring traffic signal controller

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1625990A (en) * 1925-08-29 1927-04-26 Garrett Henry Traffic signal
US1756490A (en) * 1924-09-12 1930-04-29 Crouse Hinds Co Traffic signaling system
US3302170A (en) * 1964-04-28 1967-01-31 Ibm Traffic light control buffer
US3675196A (en) * 1971-01-25 1972-07-04 Computer Systems Eng Inc Traffic signal control system

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1756490A (en) * 1924-09-12 1930-04-29 Crouse Hinds Co Traffic signaling system
US1625990A (en) * 1925-08-29 1927-04-26 Garrett Henry Traffic signal
US3302170A (en) * 1964-04-28 1967-01-31 Ibm Traffic light control buffer
US3675196A (en) * 1971-01-25 1972-07-04 Computer Systems Eng Inc Traffic signal control system

Cited By (20)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5164904A (en) * 1990-07-26 1992-11-17 Farradyne Systems, Inc. In-vehicle traffic congestion information system
US5173691A (en) * 1990-07-26 1992-12-22 Farradyne Systems, Inc. Data fusion process for an in-vehicle traffic congestion information system
US5182555A (en) * 1990-07-26 1993-01-26 Farradyne Systems, Inc. Cell messaging process for an in-vehicle traffic congestion information system
WO1992018961A1 (en) * 1991-04-15 1992-10-29 Hau Dan Chau Road and traffic control system
AU641317B2 (en) * 1991-04-15 1993-09-16 Hau Dan Chau Road and traffic control system
US20050248469A1 (en) * 1999-04-19 2005-11-10 Dekock Bruce W System for providing traffic information
US20060058941A1 (en) * 1999-04-19 2006-03-16 Dekock Bruce W System for providing traffic information
US20060074546A1 (en) * 1999-04-19 2006-04-06 Dekock Bruce W System for providing traffic information
US8606514B2 (en) 2004-12-31 2013-12-10 Google Inc. Transportation routing
US7908080B2 (en) 2004-12-31 2011-03-15 Google Inc. Transportation routing
US8798917B2 (en) 2004-12-31 2014-08-05 Google Inc. Transportation routing
US9709415B2 (en) 2004-12-31 2017-07-18 Google Inc. Transportation routing
US9778055B2 (en) 2004-12-31 2017-10-03 Google Inc. Transportation routing
US9945686B2 (en) 2004-12-31 2018-04-17 Google Llc Transportation routing
US11092455B2 (en) 2004-12-31 2021-08-17 Google Llc Transportation routing
US20090185856A1 (en) * 2006-03-17 2009-07-23 Young Dae Kim Hexagonal roadway system and traffic control system thereof
US9349288B2 (en) 2014-07-28 2016-05-24 Econolite Group, Inc. Self-configuring traffic signal controller
US9978270B2 (en) 2014-07-28 2018-05-22 Econolite Group, Inc. Self-configuring traffic signal controller
US10198943B2 (en) 2014-07-28 2019-02-05 Econolite Group, Inc. Self-configuring traffic signal controller
US10991243B2 (en) 2014-07-28 2021-04-27 Econolite Group, Inc. Self-configuring traffic signal controller

Also Published As

Publication number Publication date
DE2229284A1 (de) 1974-01-03
DE2229284B2 (de) 1975-08-28
CH558966A (de) 1975-02-14
NO135492B (OSRAM) 1977-01-03
NL7307755A (OSRAM) 1973-12-18
SE392536B (sv) 1977-03-28
NO135492C (OSRAM) 1977-04-27

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