A method and system for generating an alert for a possible collision between objects and a swinging barrier is provided. The method and system provides multiple sensing devices, a control unit, and multiple indicator devices at predetermined areas proximal to the swinging barrier. The sensing devices and the control unit electronically communicate with the indicator devices. The sensing devices are configured to establish sensing zones proximal to the swinging barrier. The sensing devices detect presence of one or more of stationary objects, approaching objects, and receding objects in the established sensing zones. The control unit tracks and differentiates the presence of the stationary objects, approaching movements of the approaching objects, and receding movements of the receding objects in the established sensing zones, and generates an alert signal. The indicator devices selectively indicate a possible collision on receiving the alert signal from the control unit.