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PRIOCOM – Traffic lights priority

PRIOCOM is a traffic light priority system that helps to promote the passage of buses and trams at traffic lights to improve the regularity of lines and the average speed of vehicles.

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PRIOCOM is a complete system designed to give public transport vehicles priority at traffic lights.

It is an opened product, based on normalized radio transmission of the bus arrival time prediction to the next traffic lights. The transmitted arrival times are calculated from models that are corrected at each moment according to the events encountered by vehicles in the approach phase. Traffic lights controllers can then deform their cycle and make the passage of vehicles coincide with a phase of green.

Fonctionnement du système PRIOCOM de priorité aux feux


PRIOCOM is a tool that allows you to devote the time saved by crossing intersections to different needs:

  • Improve the regularity of public transport vehicles
  • Increase the average commercial speed of the vehicles
  • Take into account the hazards met by the vehicles during the approach phase
  • Maintain the intervals between the transport vehicles
  • Favor directions and destinations according schedules and types of days
  • Prioritize different lines and improve the efficiency of the system for the strongest lines.
  • Measure the performances obtained and report on the efficiency of the system
  • Propose automatically more pertinent approach models.


Priocom is a solution:

  •  Efficient
    • Increase of commercial speed of 10 to 15%
    • Improvement of regularity up to 25%
    • No impact on the circulation of other vehicles
  • Specialized
    • System dedicated to the traffic regulation
    • BRT, share and dedicated lanes…
    • Hierarchical organization of bus and tramway services
  • Compatible
    • Traffic lights junctions, roundabouts, tramway lights
    • Traffic light controller interfaces: DIASER, R09.16, logical signals …
    • Emergency vehicles, fire department vehicles
  • Attractive
    • Profitable and quick return on investment
    • A contribution for the comfort for all the passengers
    • Reduction of the fuel consumption
  • Simple
    • Quick to install, no roadworks
    • Automatic adjustment of the system’s efficiency
    • Operational alarms
    • Periodical performance reports

Up to 8191 bus, 5000 intersections, 20 000 approach models, 200 depot areas

Radio frequencies

From 400 to 470 MHz, or from 168 to 176 MHz

Radio channels

3200 simplex channels, 12.5 kHz spacing

Transmit power

From 1mw to 3W. Automatic adjustment depending on the distance between the vehicle and the intersection

Radio protocol

Standardized and secured radio transmission
– NF P 99-071 (DIASER)
– VDV R09.16


52 parallel channels, sensitivity -165dBm, precision 2.5m CEP (stand alone) and 2.0m CEP (WAAS/EGNOS)

LCU-PRIO: Onboard calculator

Odometer counting input.
Logical inputs for door opening signals.
RS232, RS485 and ETHERNET interfaces for connection to an onboard calculator or a destination display.

CRT-PRIO: Junction radio modem

Connection by RS232 (DIASER/R09.16) or opto-coupled logical outputs to intersection controllers.
ETHERNET option for connection to a traffic regulation central system

Remote maintenance

– LCU-PRIO : automatic update of the embedded database and the software by radio or Wifi in the bus depots
– CRT-PRIO : remote configuration and update of the software by radio

Power supply

From +8 to +34 VDC

Temperature range

From -30°C to +70°C


– 149 x 118 x 62 mm
– IP67 housing (254 x 180 x 84 mm) for train applications

Compliance with standards

ETS 300 113 (high powered radio), EN 50155 (train), E UNECE 10 marking…

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