Abstract: The present invention concerns a motorized door having a shutter for closing and opening an area. The door comprises a series of sensors mounted on or adjacent to a leading edge of the shutter and wherein the sensors comprise ultrasonic emitter/receiver units configured for detecting the presence of an obstacle both in the opening plane of the door as well as in an approaching zone located near the opening area of the door. The door comprises a controller configured to distinguish an accidental obstacle from a non-accidental obstacle and instantly stop the movement of the leading edge when an accidental obstacle is observed during closing of the door.