Traffic Sign Recognition

It detects speed limits, no-overtaking zones and sometimes stop or give-way signs, and shows them in the instrument cluster or head-up display. Many systems combine camera data with speed limit information stored in navigation maps. It is the basis for intelligent speed assistance, which is now required on new cars in the EU.

Image processing software looks for the shapes, colours and numbers of standard signs in the camera picture.

Dirty windscreens, low sun, snow-covered or damaged signs and signs meant for side roads can lead to wrong readings. The driver remains responsible for knowing the speed limit; the system is only an aid.