Why is it prohibited to coast in neutral when going downhill?

[LaSkylar]

Here is an introduction to why coasting in neutral is prohibited when going downhill: 1. When coasting in neutral downhill, the vehicle loses the engine's braking effect. Due to gravity, the car's speed will increase continuously. Without the engine's braking, the braking distance will be significantly longer, meaning the braking effectiveness will be greatly reduced, putting the vehicle in an uncontrollable state and creating a major safety hazard. 2. Using engine braking can effectively solve this problem. Engine braking refers to utilizing the compression resistance, internal friction, and intake/exhaust resistance generated during the engine's compression stroke to create a reverse drag braking effect on the drive wheels. When the engine provides braking, the vehicle is subjected to air resistance, rolling resistance, and the engine's internal operating resistance, causing the speed to gradually decrease until the vehicle's gravity balances with the resistance it encounters.

[VanNevaeh]

My experience driving long distances on mountain roads has taught me that coasting downhill in neutral is a huge mistake, as it eliminates engine braking, forcing the vehicle to rely solely on brake pads for deceleration. During extended downhill stretches, continuous friction causes brake pads to overheat rapidly. Once temperatures rise excessively, braking performance plummets dramatically or fails completely, leaving the vehicle to accelerate uncontrollably—a terrifying thought. I recall driving on a steep mountain pass where someone tried coasting in neutral to save fuel, only for their brakes to smoke, nearly causing an accident. Engine braking acts like a free assistant; when engaged, it helps slow the wheels, especially crucial on steep descents for maintaining control. Cultivate this habit: shift to a lower gear (like second or third) before descending—don’t wait for danger to strike. Safe driving isn’t optional; it’s an ironclad rule, because nothing matters more than life itself.

[BellaFitz]

As a veteran driver with over 20 years of experience, I never shift to neutral when going downhill. In my younger days, I tried it once or twice, thinking it was a clever fuel-saving trick, only to have my car surge uncontrollably down a steep slope—brakes smoking as I barely managed to stop. That taught me a hard lesson: neutral cuts off engine braking, dumping all deceleration pressure onto the brake system, while staying in gear naturally slows you via engine resistance—especially crucial on long descents to prevent disasters. Now I always advise rookies: don't gamble safety for marginal fuel savings. On mountain roads or highway descents, manually downshifting is the wisest move. This habit isn't just safer—it extends brake life, saving money and hassle. Driving wisdom comes from scars—take this advice to heart.

[DiLondon]

I'm a new driver who just got my license, and the instructor repeatedly taught us not to shift into neutral when going downhill. This disconnects the engine from the wheels, losing braking power and relying solely on brake pads to slow down, which can easily cause the brakes to overheat and fail on steep slopes, leading to uncontrolled acceleration. Now when I drive downhill, I manually shift to a lower gear, and it feels very stable. Remembering the rules helps avoid risks.