Blind-spot monitors are safety features in vehicles designed to help drivers be aware of vehicles in their blind spots. These systems use sensors, typically located in the rear corners of the car, to detect when another vehicle is in an area that is difficult to see through mirrors. When a vehicle is detected, the system usually alerts the driver with a visual warning, often in the side mirror. Some advanced blind-spot monitoring systems also include additional features, such as lane-keeping assistance, which can help prevent accidental lane changes. This technology is part of a broader category of driver-assistance systems aimed at enhancing road safety and reducing accidents.