US2300613A - Street traffic control system - Google Patents

Street traffic control system Download PDF

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Publication number
US2300613A
US2300613A US276628A US27662839A US2300613A US 2300613 A US2300613 A US 2300613A US 276628 A US276628 A US 276628A US 27662839 A US27662839 A US 27662839A US 2300613 A US2300613 A US 2300613A
Authority
US
United States
Prior art keywords
light
crossing
control system
traffic control
beams
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
US276628A
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English (en)
Inventor
Colle Edouard Joseph
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.)
International Standard Electric Corp
Original Assignee
International Standard Electric Corp
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 International Standard Electric Corp filed Critical International Standard Electric Corp
Application granted granted Critical
Publication of US2300613A publication Critical patent/US2300613A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G08—SIGNALLING
    • G08G—TRAFFIC CONTROL SYSTEMS
    • G08G1/00—Traffic control systems for road vehicles
    • G08G1/01—Detecting movement of traffic to be counted or controlled
    • G08G1/04—Detecting movement of traffic to be counted or controlled using optical or ultrasonic detectors

Definitions

  • the invention relates to improvements in or relating to street trailic control equipment of the trado-actuated type. 4 Previous systems of traio operated control equipment comprised road contacts or studs embedded in the roadway near a crossing, these contacts or studs being operated each time a vehicle passed over them. Upon the operation of a contact an impulse is transmitted to a controller which registers the number of vehicles passing towards the crossing over each roadway leading thereto and so determines how the makes lights are to be operated. A
  • the object of the invention is to provide a trafc operated system which is not subject to heavy wear due to the passage of trafc over essential parts of the control system.
  • each roadway leading to a crossing is provided with two light-sensitive cells which are mounted at a short distance apart on one side of the roadway, are arranged to be actuated by beams of light directed on to them from a lamp or lamps mounted on the opposite side of the roadway, and'control recording means arranged to differentiate between interruption of the lightbeams in different ways.
  • light and light-sensitive devices are to be interpreted as including infrared rays and devices responsive thereto.
  • a lamp standard AL which may comprise either a single lamp arranged to direct beams of light on to each of the photo-electric cells mounted at PAI and PA2 o r two lamps each of which is arranged to direct a beam of light on to either PAI or PA2. .
  • the lamp and cells are mounted at such a height above the ground that when a vehicle passes along the roadway the beams of light impinging on the photo-electric cells are interrupted.
  • Each photo-electric cell is arranged to control a relay in a chain of relays at the traffic control cabinet TCC.
  • the traiilc controlling register device at TCC registers the fact that avehicle has passed along road A towards the crossing. If, however, the relays controlled by PAI and PA2 do not operate simultaneously it is not possible to operate the register device and hence vehicles proceeding along the side o the road opposite to the lamp do not eiect the controller.
  • the relays controlled by the photo-electric cells can be so interconnected that the order in which the beams of light are interrupted determines whether the register device makes a record of a vehicle passing towards the crossing or not. For example a vehicle passing along the right hand side of the road towards the crossing will rst interrupt the beam of light between AL and PAI and then the beam of light between AL and PA2. This order of interruption of the light beams ensures that the vehicle is registered as proceeding towards the crossing. If, however, a vehicle passes on the right hand side of the roadway away from the crossing then the beam of light between AL and PA2 is first interrupted followed by the beam of light between AL and PAI. This order of interruption is arranged to have no effect on the register device.
  • Both the housings for the lamps and the photo-electric cells are provided with screens arranged to prevent daylight and direct beams of light, due to the sun or due to car headlights,

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Circuit Arrangement For Electric Light Sources In General (AREA)
US276628A 1938-06-04 1939-05-31 Street traffic control system Expired - Lifetime US2300613A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
BE223873X 1938-06-04

Publications (1)

Publication Number Publication Date
US2300613A true US2300613A (en) 1942-11-03

Family

ID=3866145

Family Applications (1)

Application Number Title Priority Date Filing Date
US276628A Expired - Lifetime US2300613A (en) 1938-06-04 1939-05-31 Street traffic control system

Country Status (5)

Country Link
US (1) US2300613A (es)
BE (1) BE428437A (es)
CH (1) CH223873A (es)
FR (1) FR855566A (es)
NL (1) NL57785C (es)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2521683A (en) * 1944-06-29 1950-09-12 Eastern Ind Inc Traffic detection apparatus
US3235738A (en) * 1962-05-14 1966-02-15 Sensi Tronics Inc Photoelectric apparatus for detecting objects in an area

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2521683A (en) * 1944-06-29 1950-09-12 Eastern Ind Inc Traffic detection apparatus
US3235738A (en) * 1962-05-14 1966-02-15 Sensi Tronics Inc Photoelectric apparatus for detecting objects in an area

Also Published As

Publication number Publication date
BE428437A (es)
FR855566A (fr) 1940-05-15
CH223873A (fr) 1942-10-15
NL57785C (es)

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