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This is the mathematical formula for DGT radars



The General Directorate of Traffic (DGT) has an extensive network of speed cameras so that drivers adhere to the limits set. It is estimated that in 4 out of 10 accidents, The speed at which the car was traveling is a determining factor. For this reason, the agency currently has 780 fixed and 545 mobile radars.

Not all drivers know What speed do speed cameras detect?. The answer to this big question will depend on several factors, however The key is at number 7. Radars have A margin of error of 7 km/h when the motorway speed limit is 100 km/h or less.

This means that on a section marked at 50 km/h, the radar will go off if you are driving faster than 57 km/h, while if the maximum road speed is 40 km/h, the device will go off if you exceed 48 km/h or more. This is the case with all speed limits up to 100 km/h.

The situation is different when the speed limits exceed this number, for example, in Highways and Highways. in these cases, The number 7 also plays an essential rolesince 7% limit.

In this way, if the segment controlled by the speed radar is 110 km/h, the device is activated when it detects that the vehicle is passing by at a speed of 117.7 km/h or more. The same thing happens in sections of 120 km/h, where the shot will be taken at speeds of 128.4 km/h or more.

margin of error

DGT respects these margins because its radars contain The error probability is between 3% and 7% approximately, Depending on the device model. It should be noted that the newer radars have a higher resolution.

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The differentiation between speeds over 100 km/h and those below is due to the fact that if we apply a margin of error of 7% at speeds of 30 km/h The radar will jump at a speed of 33 km / h, Something that is hard to detect for drivers who have analog speedometers in their cars.

To avoid potential confusion, the DGT applies a tolerance threshold of 7 km/h, So in the 30 km/h section, the radar jumps at 38 km/h or higher.

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