A blind spot warning system sends radar signals to zones on the sides and the rear of a vehicle to detect when another vehicle is close by, such as less than the width of a lane or car length away, and flashes a warning light in the outside mirror on that side of the vehicle. It may also activate an audible warning if a driver activates a turn signal in the direction of the other vehicle.
The good things about such warning systems are that they monitor areas that might be hard for the driver to see and alert a driver who isn’t paying attention to surrounding traffic. The bad thing about them is they can’t distinguish between vehicles you know are there and the ones you don’t, so they can annoyingly activate when you don’t need their help.
Blind spot warning systems often are complemented by rear parking sensors that beep when you’re about to kiss the bumper of the vehicle behind you and rear cameras that show on a dashboard screen what’s immediately behind you when you shift into Reverse.
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