Blind spot detection (or monitoring) watches for cars coming up on your rear and pulling alongside. They spot what you might miss with a quick glance in the mirror or turn of the head ...

BSD stands for blind-spot detection, a safety tech that uses various sensors to detect other vehicles in a car's blind spot and then alert the driver.

The first is a blind spot detector for motorcycles (and cars, eventually). The sensor beams out 10 feet to the side and 26 feet in back of the bike and measure the temperature of the highway.