Autonomous radars in France in 2025 can remain in one position for anywhere from a few days to several weeks.
The maximum time they can remain in one location is usually limited by two factors:
Battery charge: Radars operate completely autonomously and require battery replacement on average every 5-7 days. They are often moved or replaced during battery maintenance.
Duration of operation or monitoring programs: These devices are designed for operational monitoring in hazardous areas (during roadworks, temporary restrictions). As soon as the need for monitoring a specific meter of road disappears, or the radar is scheduled to change position within a "protected route" (itineraires securises), it is moved to a new location.
Specifics of operation in 2025:
They are often moved within a single "control zone" (a section of road tens of kilometers long) to prevent drivers from becoming accustomed to their exact location.
Certified to measure speed in both directions simultaneously over distances of up to 30–100 meters.
Highly portable—the radar is built into a trailer and can be moved to a new location in less than 30 minutes.
In 2025, the fleet of autonomous radars (also known as "construction site radars" or radars chantiers) in France will increase significantly:
Current Number: As of late 2024 - early 2025, approximately 400-500 units of this type are in operation.
Plans for 2025: The government plans to increase the total number to 550 active cabins by the end of 2025. Some sources indicate a long-term goal of doubling the fleet.
General Context: These devices are part of the total fleet of automatic inspection systems in France, which in 2025 totals approximately 4,160-4,750 devices of all types (fixed, mobile, autonomous, etc.).
Why their number matters:
Autonomous radars are considered among the most effective and "threatening" for drivers, as they move regularly, operate in both directions, and are often installed in areas with temporary speed limits where drivers are less vigilant. While the overall number of fixed posts remains stable, authorities are emphasizing the mobility and modern equipment of autonomous and tower-mounted radars.
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