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Can Cruise Control Be Used on Long Downhill Slopes?

2 Answers

JamesonMarie

07/29/25 9:58am

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.

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LeIsabel

08/13/25 12:16pm

As an experienced driver who frequently navigates mountain roads, I've encountered numerous long downhill stretches during road trips. I remember that time on the Qinghai-Tibet Highway with its exceptionally long and steep descent. Trying to save effort, I used cruise control, only to find the vehicle accelerating uncontrollably until the brakes nearly failed - it was a close call. Since then, I've strictly avoided using cruise control on downhill sections. Cruise systems are designed to maintain speed on level ground, but gravity causes automatic acceleration during descents. The system may not decelerate promptly, creating risks of speed loss control and brake overheating. Manual control proves safer - I always downshift to let engine braking assist, which prevents excessive brake wear and ensures peace of mind. When driving in remote areas, never compromise safety for convenience. Safety must always come first.

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