Approach and departure angles
Approach angle is the maximum angle of a ramp onto which a vehicle can climb from a horizontal plane without interference.  It is defined as the angle between the ground and the line drawn between the front tire and the lowest-hanging part of the vehicle at the front overhang. Departure angle is its counterpart at the rear of the vehicle – the maximum ramp angle from which the car can descend without damage. Approach and departure angles are also referred to as ramp angles.
Approach and departure angles are indicators of off-road ability of the vehicle: they indicate how steep obstacles, such as rocks or logs, the vehicle can negotiate according to its body shape alone. 
- angle of approach, The free dictionary
- "Angle of Approach". carlist.com. Retrieved 2014-12-04.
- "49 CFR 523.2 - Definitions.", U.S. Code of Federal Regulations, Cornell University Law School, retrieved 2014-12-04,
Approach angle means the smallest angle, in a plane side view of an automobile, formed by the level surface on which the automobile is standing and a line tangent to the front tire static loaded radius arc and touching the underside of the automobile forward of the front tire.
- Lane, Keith (2002). Automotive A-Z: Lane's Complete Dictionary of Automotive Terms. Veloce Publishing Ltd. p. 376.
- Approach and Departure Angles at Why High End?
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