ISA can use cameras alone to identify speed limits through traffic sign recognition. Cameras, however, have limited range, can be blinded by rain or snow, and perform poorly when needing to recognize conditional and variable speed limits, such as speed limits for specific weather conditions or vehicle types.
Advanced digital map data solves these issues – containing verified speed limit data that ‘sees’ beyond camera range and performs in all conditions. The map data fuses with a vehicle’s ADAS function to prepare for changing speed limits. The result is not only greater vehicle safety, but also increased driver comfort and energy efficiency.