We've all been taught to check blind spots before changing lanes, but sometimes cars can creep up next to you unexpectedly. To help reduce the number of accidents caused by blind spots, manufacturers are putting in blind-spot monitors on many of their models. Here at Coastal Auto Group, we have several vehicles that have this safety feature. 
These monitors rely on sensors that are installed on the car. The sensors can be set to continually check to see whether other vehicles are in your blind spot, where they can't be seen in any of your mirrors. If they detect the presence of a vehicle, they'll alert you. 
The alerts are typically in the form of a light in your side mirror being turned on. Sometimes, the monitoring systems can make noises or even vibrate the steering wheel if it seems that you're about to get in an accident.