Have you been behind the wheel of a new car lately? Beyond infotainment systems replacing CD players or fancy adaptive cruise control and lane keep abilities, newer models can also tell you when posted speed limits change. Pass a speed limit sign, and some cars will display the new limit on your instrument cluster, infotainment screen, or head-up display almost instantaneously. It's an advanced driver assistance system (ADAS) known as traffic-sign recognition (TSR), and it uses a mix of cameras, data, and sophisticated image-processing software to update you on roadside signs as you drive. Rather than relying on navigation data alone, traffic-sign recognition incorporates an additional layer of awareness by continuously scanning the road ahead of you for important traffic markers.