Yes, coasting downhill in neutral is illegal in more than 40 states. The statutes target a specific act: traveling on a downgrade with the transmission in neutral or the clutch held down, which eliminates engine braking and leaves your friction brakes as the only thing controlling your speed. In the handful of states without a specific ban, you can still be cited under general safe-driving laws if coasting contributes to a loss of control.
What the Laws Actually Prohibit
The wording varies by state, but the rule is consistent across the roughly 40-plus jurisdictions that address it: when you are going downhill on a public road, the vehicle must stay in gear. These laws typically cover all motor vehicles, not just trucks or buses.
A small group of states take a lighter approach. Around seven allow coasting for all vehicle types, and a couple more restrict it only for commercial trucks and buses. The absence of a dedicated statute does not mean the practice is safe from legal consequences. Every state requires drivers to keep their vehicle under control and operate with reasonable care, so coasting that leads to an accident or an obvious hazard can draw a reckless driving, negligent operation, or failure-to-maintain-control charge. Those are heavier citations than a straight coasting ticket would be.
Penalties If You Get Cited
Where coasting is specifically banned, the violation is almost always a traffic infraction rather than a misdemeanor. You get a ticket and a fine, not jail time. Base fines for a straightforward coasting citation generally fall between $150 and $250, with court fees and surcharges adding to the total depending on the jurisdiction.
The bigger financial hit comes when an officer writes the stop under a broader charge. If coasting is tied to erratic driving or a near-miss, the citation can become reckless driving, which carries steeper fines, points on your license, and higher insurance premiums. Accumulate enough points and you can lose the license entirely.
Liability After an Accident
This is where the real cost shows up. In a state that bans coasting in neutral, violating that statute while causing a crash can establish negligence per se. You are presumed negligent because you broke a specific safety law and someone was hurt as a direct result. The other side does not have to argue about what a reasonable driver would have done; the statute settles that question.
Even in states without a specific coasting ban, a plaintiff’s attorney can present the practice as ordinary negligence. Expert testimony about brake fade, reduced vehicle control, and delayed reaction time makes a strong case that no careful driver would coast in neutral on a serious downgrade. Insurance adjusters weigh the same factors. If the investigation shows you were in neutral at the moment of impact, expect that fact to shape both the fault determination and the claim negotiation.
Why Drivers Do It, and Why It Backfires
Most people who coast in neutral believe it saves fuel. With a modern fuel-injected engine, it does the opposite. When you coast downhill in gear, the engine control module detects that the wheels are driving the engine and cuts fuel delivery to near zero. Momentum keeps the engine turning on essentially no fuel. Shift into neutral and the engine has to idle, which requires a steady trickle of gas. You burn more fuel in neutral than you would in gear. The old intuition came from carbureted engines and no longer applies.
The safety case is more serious. On a long descent, relying only on friction brakes builds heat faster than the system can shed it, and brake fade sets in: the pedal grows soft, stopping distance stretches, and after a bad fade event the system may need professional inspection before it can be trusted again. There is also a reaction-time cost. If you need to accelerate out of a hazard, being in neutral means re-engaging a gear first, whether that is a clutch-and-shift or a brief automatic lag. Either way, you have added delay to a moment where fractions of a second matter.
A Note on Electric Vehicles
Electric and hybrid vehicles handle this differently. Lifting off the accelerator engages regenerative braking, which slows the car by using the motor as a generator and feeding charge back into the battery. Turning regen to its lowest setting or off is functionally the same as coasting in neutral, but EVs can accelerate instantly from any regen setting, so the reaction-time problem is smaller. On a full battery, regen may be limited at the start of a long descent because there is nowhere to store the energy, and the physical brakes carry more of the load until the charge level drops.
A Note on Commercial Drivers
Federal trucking rules do not fill this space; the relevant section of the Federal Motor Carrier Safety Regulations is listed as “[Reserved].” The gap matters less than it looks, because most state coasting laws apply to all motor vehicles, trucks included. A loaded tractor-trailer on a steep grade faces far more severe fade risks than a passenger car, and many carriers prohibit the practice in their own safety policies regardless of what the state statute says. For a commercial driver, a downhill accident while coasting can affect the carrier’s safety record and, if the charge rises to reckless driving, the commercial license itself.