Can Cruise Control Be Used on Long Downhill Slopes?

[JamesonMarie]

Cruise control can be used on long downhill slopes, but it is not recommended. The reasons are as follows: 1. Introduction: When using cruise control on steep downhill slopes, the vehicle speed may increase, exceeding the set speed, and it cannot be used for deceleration. Therefore, some drivers have received speeding tickets while using cruise control. Cruise control only adjusts the throttle automatically to maintain the set speed. When the speed exceeds the set value, it reduces or even stops fuel supply, but it does not automatically apply brakes to slow down. On downhill slopes, if the downward force exceeds the motion resistance (including air resistance, rolling resistance, engine braking force, etc.), the vehicle will accelerate. 2. Suggestion: On steep downhill slopes, it is recommended to shift to S mode, as S mode increases engine speed compared to D mode, enhancing engine braking force. This reduces the need for frequent braking, preventing excessive heat generation and brake wear. However, D mode is generally sufficient for normal road conditions.