Road sign information bases its information on the speed-dependent road signs that the car passes, as well as map data. Physical signs passed have highest priority, which may be necessary for roadworks, for example.

If road sign information cannot interpret and provide speed information to the driver support systems, the automatic speed limiter is set in standby mode and changes to normal speed limiter. In such cases the driver must intervene and brake to a suitable speed.

The automatic speed limiter will be reactivated when road sign information can once again interpret and provide speed information.