Blind-spot warning (BSW) is a technology that detects and warns of vehicles you can't see alongside your car. It gives a visual, audible, and/or tactile alert to indicate that it's unsafe to merge or change lanes. The system may provide an additional warning if you use your turn signal when there is a car in the lane next to you.
The blind-spot warning safety feature registered high satisfaction scores across most auto brands, but especially for Lexus, Hyundai, and Toyota. The three brands rated at nearly 90 percent very satisfied among owners surveyed. One owner of a 2013 Lexus ES said: "I love it—since all the new cars have such awful blind spots, I couldn't live without it."