This solar powered assembly for detecting the formation of a traffic queue and of vehicles at rest is to be fixed to a 100 x 100 post at a height of 4 metres, and is made up of:
- solar powered detection radar and radio. the radar is placed at the end of the support. The purpose of this radar, with a range of about 70 m, is to detect vehicles travelling at a speed of between 20 km/hr and 60 km/hr - the vehicle configuration when a queue is forming. On this support there is also a solar module capable of trapping daylight (even in fog and rain) allowing the system to be completely self-sufficient both in winter and summer.

The speed detection radar is equipped with control electronics and a communication transmitter and a stationary battery - with everything contained in the infra red receiver housing. Thus as soon as 6 vehicles are detected with a speed of between 20 km/hr and 60 km/hr, the HF communication transmitter (also common with the infra-red barrier) immediately issues the command to illuminate and start flashing the type AK30 solar powered casing placed 1000 metres before the detection system.
Since the radar does not detect vehicles travelling at below 10 km/hr, the device is complemented by a vehicle at rest detection system using a digital infra red barrier.
- A vehicle at rest detection system takes the form of a solar-powered infrared barrier and radio the purpose of which is to detect vehicles at rest - traffic queue configuration. This solar powered infrared barrier is made up of a "transmitter" infrared and a "receiver" infrared

On one side of the carriageway is a "transmitter" infrared placed on a support (e.g. 80x80). On the other side of the carriageway is a "receiver" infrared placed on a the 100 x 100 support used for the radar.. This assembly has to be aligned. Each infrared unit takes the form of a sealed housing equipped with fixing rails. On the front face of the housing is the infra-red sensor fitted with a visor to reduce contamination of the sensors.

The "transmitter" infra-red is equipped with a solar power module capable of trapping daylight - even in fog and rain - allowing the system to be completely and permanently self-sufficient both in winter and summer. Inside the transmitter infrared housing is a set of Nickel Cadmium batteries. This "receiver" infrared is powered by the detection radar solar power module.

In order to facilitate and check the installation, once the system is in operation, a luminous diode indicates when the sensors are correctly aligned. These detectors are installed at a height of about 80 cm (depending on the site configuration). Installation is rapid as they are fitted using two clamps. The distance between the "transmitter" infrared and the "receiver" infrared is between 1 and 6 traffic lanes (the distance between the transmitter and receiver from 3 to 25 metres). It only takes 15 minutes (including fixing to the post and adjustment) to install all the detectors.

No unwanted triggering due to downpours of rain, snow, passing birds, dirt (splashed mud). Both the infrareds are equipped with a digital gain control.

In the event of standing snow on the solar power module, the device will continue to operate for 15 days.

Once traffic starts to flow once again, the illuminated casing automatically switched off since the radar is no longer detecting vehicles in queue formation and the infrared barrier is no longer detecting vehicles at rest. If a single detector detects a traffic anomaly however, it will immediately illuminate the illuminated type AK30 casing and start it flashing.