Most automotive night-vision systems, which spot pedestrians and then flash a warning on the car's console, suffer from a metaphorical blind spot: Drivers are safest when looking at the road, not a screen. The Mercedes Spotlight function, part of the optional Night View Assist Plus system, solves the puzzle. A windshield-mounted night-vision camera continuously scans the road up to 260 feet ahead for human shapes. If the computer detects a potential pedestrian, it signals the high beams to flash at the object four times and triggers an alarm to warn a driver of the hazard ahead. Mercedes says the system detects pedestrians 1.3 seconds earlier than a driver can.