Speeding – Mobile, on-board or off-board radar: the official 2022 table of margins of error

If the technical margins established by Road Safety in the event of speeding still cause much reaction among drivers, some of whom dispute the abuse of language and the veracity of use, they officially exist. Here they are, concerning the so-called mobile radars.

At the wheel, nobody, or almost, can claim to be safe from a minor speeding violation. Always is itit is necessary to make the distinction between the speed at which a radar records the speed of the vehicle and the one which will then be retained.

5 km/h or 5%

Thus, for example, in the event of exceeding the authorized speed on a road limited to 90 km/h, if you receive a speeding ticket on which the speed of 92 km/h is mentioned, this means that at the time of recording your speed, you were driving at 97 km/h. Indeed, up to 99 km/h while driving (regardless of the section), a margin of error called technical margin de facto subtracts 5 km/h from the speed recorded by a radar, whether mobile or fixed. From 100 km/h on the other hand, the margin is calculated as a percentage, and it is then – 5% which is removed the speed of a vehicle recorded by a dedicated radar.

The spirit and the letter

In other words, when you are driving at 135 km/h on a French motorway (and therefore speeding), it is not a priori possible to be caught for speeding* while the speed is however, everyone knows, limited to 130 km/h and that the latter must be respected by everyone and in all circumstances. It prevents, if we subtract the 5% of the official technical margin from the 135 km/h, we then obtain the speed of 128.5 km/h : we are therefore still in the nails, safe from receiving a ticket for speeding. Discover the official table of technical margins (also known as tolerance but which can more surely be called “margins of measurement error”) of a mobile radar, on board or off a vehicle.

*It is a little more complex to use, in particular because the automobile counters indicating the speed of the vehicles are not all calibrated with the same precision, in the same way as the radars

The official table of technical margins from a mobile, on-board or on-board radar

Speed ​​limited to Limit of error applied PV for speeding from (speed of the vehicle at the time of the flash)
Speed ​​limited to50 km/h Limit of error applied5 km/h PV for speeding from (speed of the vehicle at the time of the flash)56 km/h (retained 51 km/h)
Speed ​​limited to70 km/h Limit of error applied5 km/h PV for speeding from (speed of the vehicle at the time of the flash)76 km/h (retained 71 km/h)
Speed ​​limited to80 km/h Limit of error applied5 km/h PV for speeding from (speed of the vehicle at the time of the flash)86 km/h (retained 81 km/h)
Speed ​​limited to90 km/h Limit of error applied5 km/h PV for speeding from (speed of the vehicle at the time of the flash)96 km/h (retained 91 km/h)
Speed ​​limited to110 km/h Limit of error applied5% PV for speeding from (speed of the vehicle at the time of the flash)117 km/h (retained 111 km/h)
Speed ​​limited to130 km/h Limit of error applied5% PV for speeding from (speed of the vehicle at the time of the flash)138 km/h (retained 131 km/h)
Published on 05/10/2022 Updated 05/10/2022



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Speeding – Mobile, on-board or off-board radar: the official 2022 table of margins of error


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