1, and approach angle is the maximum included angle between the horizontal plane and the plane tangent to the outer edge of the front tire (static load). Any rigid parts fixed to the vehicle in front of the front axle shall not be lower than this plane. The bigger the approach angle, the less likely it is that a car will have a contact accident when getting on or off the ferry or driving off the road, and the better the passing performance of the car.

2. Departure angle refers to the angle between the tangent from the protruding point at the rear end of the car body to the rear wheel and the road surface when the car is fully loaded and stationary, that is, the maximum angle between the horizontal plane and the plane tangent to the outer edge of the tire of the last car wheel (static load). Any rigid parts fixed to the car behind the last wheel shall not be lower than this plane. Represents the ability of cars to leave obstacles (such as hills, gullies and depressions) without collision. The larger the departure angle, the better the passability of the car.

Compared with approach angle, the departure angle is suitable for uphill. Whether the rear bumper will get stuck on the ramp or not depends on the departure angle of the vehicle when it goes downhill. The front wheel has been driven to the flat ground and the rear wheel is still on the ramp. The larger the departure angle, the steeper the slope the vehicle can descend without worrying about the rear bumper being stuck.