Does the fixed radar only measure one side or even the opposite side on the same road?

Fixed radar speed measurement on the same road usually only measures the speed in one direction. Because there is usually only one radar speedometer in the same direction, it can only measure the speed of vehicles in the same direction.

But if there are two radar speedometers on the road, one on the roadside and the other on the opposite road, then the two radar speedometers can measure the speed in two directions respectively. In this case, it is necessary to test the vehicle twice, because each radar speedometer will measure the speed of the vehicle independently.

It should be noted that different countries and regions may have different traffic regulations, so the specific implementation of radar speed measurement may be different. If you have any questions or need more detailed information, please consult the local traffic management department or relevant institutions.