A collision detection and warning system for an automobile having left and right audio speakers and left and right turn signals includes at least four sensors and a control module. The sensors may be mounted on exterior surfaces of the automobile, such as on sides of the front and back bumpers, and are connected to the control module and the automobile's electrical system. The sensors are mounted in mounting assemblies and can be angularly oriented. Each corresponding front and back pair of sensors may detect an obstacle in the driver's 'blind spot' when oriented in an appropriate beam splitting arrangement. Upon obstacle detection and actuation of a respective turn signal, the control system sends an alarm tone to the automobile's audio speaker on the side of the car nearest the danger and/or activates a respective alarm light to indicate the direction of danger.
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