BLIS (Blind Spot Information System) is a driving assistance technology that monitors the blind spots on both sides of a vehicle via radar or cameras, and it activates automatically when the vehicle speed exceeds 10 km/h. The system uses 24GHz radar sensors or infrared cameras installed on the door mirrors or rear bumper to scan the vehicle dynamics in real time within a range of approximately 3 meters behind and 9.5 meters to the side. If a vehicle approaching in the blind spot is detected, it will alert the driver by flashing the warning light on the A-pillar; if the turn signal on the same side is activated at this time, the warning light will switch to high-frequency flashing accompanied by an audible alarm. This system is particularly effective in rainy weather, at night, or when the vehicle behind does not have its headlights on, and it can reduce lane-change accident rates by 43% (Volvo's actual measurement data). Currently, local market models such as Proton X90 and Perodua Ativa have gradually been equipped with this function, and the modification market can also implement it by installing third-party systems such as Che Gong She, with prices ranging from approximately RM1,500 to RM3,800. It should be noted that this system cannot replace manual observation, and drivers still need to abide by the 3-second rule for lane changes.
