公开(公告)号：US3886515A

公开(公告)日：1975-05-27

申请号：US36372973

申请日：1973-05-24

Applicant: THOMSON CSF

Inventor： COTTIN JEAN ,  LAXAQUE JEAN

IPC: B61L25/02 ,  B61L27/00 ,  G08G1/123 ,  G08G1/12

CPC classification number: G08G1/123 ,  B61L25/023 ,  B61L25/026 ,  B61L27/0077

Abstract: A plurality of public-transport surface vehicles such as buses, each identified by an individual number, are equipped with transmitters for sending out that identification number together with heading and positional data conveying information on direction of travel and momentary distance from a point of departure; the transmitted information may also indicate the state of occupancy of the vehicle. This information is received at transit points along the route, each transit point including circuits for determining from the directional and distance data the distance of an approaching vehicle from that point. If the transit point is a passenger station, the shortest vehiclular distance or distances are registered with the accompanying identification and occupancy data in one or more stores for display to waiting passengers. The directional and distance data can also be intercepted by a traffic-control post to detect the approach of vehicles at an intersection as an aid in the operation of traffic lights. The data-evaluating equipment at any such transit point includes a comparator determining whether a newly arriving signal is from a vehicle whose data have already been registered in a store thereof, i.e. whether the transmitting vehicle is among those closest to that point at the instant of reception.