A picture processing module searches scanned pictures for known traffic signs and compares the results with the navigation data. The system processes speed limit signs, no-overtaking signs, no-entry signs on one-way streets and any supplementary instructions, as well as associated restriction clearance signs, and then displays them to the driver.

This system works in conjunction with a camera to recognise lane markings on the road, including yellow lines during roadworks, traffic cones, and other roadside or lane borders.