Unfortunately, drivers regularly fail to notice the road inspectors' stopped vehicles in time. The Collision Risk Warning service aims to prevent this happening.
Collision Risk Warning is not an entirely new concept. Some time ago pilot projects were undertaken with the Flister service which warned road users over radio and the mobile network about stationary road inspector vehicles. Rijkswaterstaat is currently developing this service as part of the Cooperative ITS Corridor project. This is based on internationally standardised and future-proof technology: cooperative communications over WiFi-P
During the test on the A67 between Eindhoven and Venlo a Rijkswaterstaat road inspector parked their vehicle next to the hard shoulder. During the test, lane 1 was not closed by displaying red crosses as there were no such signals at the test site. Once the vehicle was stopped the road inspector activated the Flister service. As a result the coordinates of the vehicle were transmitted to the NDW (Dutch national road traffic database) in the usual way.
From roadside to vehicle
A new development was that the Flister message was also converted to a DENM message, based on the international standard. This message, containing information about the location of the vehicle, was then transmitted directly from a Road Side Unit (RSU) with WiFi-P beacon to passing test vehicles. For this test, two test vehicles were fitted with basic and flexible On Board Units (OBU) with displays, which complied with the project requirements.
During the test the Flister message was correctly received over WiFi-P by the test vehicles, which included a standard Rijkswaterstaat pool car. The message was received in the vehicles at the correct time and place, and displayed as defined. WiFi-P made it possible to present the warning quickly and correctly in approaching vehicles.
Participants in the project
Rijkswaterstaat (management and development)
NDW (national road traffic information database)
Visio ITS Services