What is the effect of excessive positive caster on a vehicle's steering?

Excessive positive caster can significantly affect a vehicle's steering dynamics. When caster angle is increased positively, it enhances the self-centering ability of the steering but also raises the effort required to turn the wheel, especially at low speeds. This is because with a higher caster angle, the front wheels are pushed backward in relation to the steering axis. Consequently, the driver must exert more force to create the necessary steering input, leading to increased steering effort during maneuvers.

While excessive positive caster does contribute to improved cornering stability, which is one of the other response options, the emphasis here is on the steering effort experienced by the driver. The enhanced self-centering effect can help stability but at the cost of maneuvering ease in tight situations, particularly in low-speed driving scenarios, making increased steering effort a more immediate concern. Therefore, the most accurate understanding of the impacts of excessive positive caster is its effect on steering effort.