The departure angle is the maximum angle between the horizontal plane and the plane cut to the outer edge (static load) of the last wheel of the vehicle. Any rigid part fixed to the vehicle behind the last wheel must not be below this plane.
Relative to the proximity angle used in climbing, the departure angle is applicable when downhill. As the vehicle descends all the way, the current round has already travelled to the flat ground. When the rear wheel is still on the slope, the rear bumper will not be stuck on the slope. The key is to leave the corner. The greater the departure angle, the steeper the ramp down the vehicle, without worrying about the rear bumper stuck.
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