The safest way to check a vehicle's blind spots is to combine the use of a Blind Spot Monitoring System (BSM/BLIS) with manual observation. This system detects vehicles within a range of 3 to 8 meters to the side and rear via radar sensors in the rear bumper. It automatically activates when the vehicle speed exceeds 10 km/h and alerts the driver to potential risks through warning lights on the side mirrors and audible alerts. In practice, before changing lanes, the driver should first check the rearview mirrors, then quickly turn their head 45 degrees to confirm the blind spot, while paying attention to system alerts. If the yellow icon on the side mirror remains illuminated or flashes, it indicates there is a vehicle in the blind spot, and lane changing should be postponed. Note that adverse weather may affect the radar's sensitivity, in which case dirt on the sensors should be manually cleaned. Blind spot ranges vary across different vehicle models, so it is recommended that owners understand their vehicle's blind spot characteristics through static tests (such as the marking method). Importantly, this system cannot fully replace manual observation-its function automatically deactivates during low-speed driving or reversing, so drivers must maintain active safety awareness.
