The angle from the front point of ground contact of the front tire to any projection of the apparatus in front of the front axle is considered the:

The angle from the front point of ground contact of the front tire to any projection of the apparatus in front of the front axle is referred to as the angle of approach. This concept is crucial in evaluating how effectively a fire apparatus can navigate over obstacles or uneven terrain.

The angle of approach specifically measures the steepness of the incline that the vehicle can ascend or descend without the front portion of the vehicle striking the ground. A smaller angle indicates a steeper incline, which may lead to the apparatus getting hung up or sustaining damage. Understanding this angle helps operators plan routes more effectively and avoid situations that could immobilize the vehicle.

In contrast, the angle of departure relates to the rear of the vehicle, the angle of steer pertains to the turning capabilities, and the angle of inclination refers to how much the vehicle can tilt sideways or forwards/backwards without compromising stability. Each of these angles serves different purposes in vehicle operation and safety, but the angle of approach is directly relevant to navigating obstacles in front of the apparatus.