A system is provided for detecting a blind spot for a driver of a vehicle. The system includes a side mirror. The side mirror is arranged on a body of the vehicle and includes a side mirror body, a mirror, and a supporting structure. The system also includes a detection system. The detection system is physically coupled with the side mirror to detect an object in a detection zone of the detection system. The detection zone covers the blind spot, and the detection system includes a detection module, an alert indicator, and a control module. The detection module includes at least one of a transmitter and a receiver, and the alert indicator is configured to send an alert light to the driver at a predetermined angle such that the alert light does not interfere with drivers of other vehicles close to the vehicle.