What to do if your car breaks down on the highway: 7 safety steps, who to call, and how to stay alive on the shoulder. Updated for 2026 drivers.
If your car breaks down on the highway, ease onto the right shoulder as far from traffic as possible, turn on your hazard lights, stay buckled inside the vehicle, and call 911 or a roadside service before getting out. That short sequence keeps you alive in the first 60 seconds, which is when shoulder fatalities are most likely to happen.
Last reviewed: 2026-06-07.
Key Takeaways
- The AAA Foundation for Traffic Safety reports that roughly 300 people are killed every year in the US after exiting a disabled vehicle on the shoulder (AAA Foundation, 2023).
- When your car breaks down on the highway, the right shoulder is far safer than the left, and a full exit ramp is safer than either.
- Stay inside the vehicle with your seat belt on whenever possible; the cabin is the strongest structure you have.
- Every US state now has a Move Over law requiring traffic to slow and shift lanes for stopped vehicles, but compliance is around 71% (GHSA, 2024).
- Wheelingo is free to download and drills the exact highway emergency scenarios your state DMV tests on the road exam.
What counts as a highway breakdown? A highway breakdown is any unexpected mechanical or tire failure that forces you to slow down or stop on a limited-access road. It includes flat tires, overheating, dead batteries, transmission failures, and running out of fuel. The defining feature is that you can't safely continue driving, so you must move out of live traffic lanes immediately.
The first time your engine sputters at 70 mph, your brain freezes. That's normal, and it's also exactly the moment when good decisions save lives. The National Highway Traffic Safety Administration logged more than 566 fatalities in shoulder-related crashes during 2022 alone, and the majority involved drivers who got out of their cars too quickly (NHTSA, 2023). The seven steps below come straight from state DMV handbooks and the AAA roadside safety playbook, and they apply whether you drive a 2008 Civic or a brand-new EV.
A car breakdown on a 30 mph residential street and a car breakdown on a 70 mph interstate are two very different events. Closing speed on the highway is what makes the difference. A semi-truck traveling 65 mph covers 95 feet every second, and the average driver reaction time is about 1.5 seconds. That means a truck driver who spots you on the shoulder needs 142 feet just to react before braking begins.
The Insurance Institute for Highway Safety reports that roadside worker and motorist fatalities on highway shoulders climbed 9% between 2021 and 2023 (IIHS, 2024). Most of those deaths involved a driver standing next to or behind a disabled vehicle. The lesson is blunt: the shoulder is not a safe space. It is a temporary holding area while you wait for help.
Is it illegal to stop on the shoulder of a highway? Stopping on the shoulder for a genuine emergency, mechanical failure, or medical issue is legal in all 50 states. Stopping to check a map, take a phone call, or rest is illegal on most interstates and can result in a citation. If your car breaks down on the highway, you are protected; if it didn't, move to the next exit.
Drill these exact steps in the Wheelingo app — free to download.
The moment you feel a vibration, hear a pop, or see a warning light, your only goal is to reach the shoulder. Check your right mirror and blind spot, signal right, and ease the car over. Do not slam the brakes. If you have any momentum at all, use it to coast farther onto the shoulder or, ideally, all the way to the next exit.
A 2024 GHSA report noted that drivers who reached an exit ramp before stopping were 7 times less likely to be struck than those who stopped on the shoulder of the main lanes (GHSA, 2024). If the exit is within half a mile and your car can still roll, take it.
Hit your hazard lights before you fully stop. They warn drivers behind you that your speed has dropped. Once stopped, turn your front wheels to the right, away from the road. If a vehicle rear-ends you, your car will roll into the grass instead of into a live lane.
This is the same principle used in our uphill and downhill parking guide: wheels turned right when there's no curb, so a runaway car ends up off the road. For a fuller emergency-equipment list, see our car emergency kit essentials.
Your seat belt and the steel cage of your cabin are stronger than anything you can do on foot. The AAA Foundation found that staying inside the vehicle with the seat belt fastened cut shoulder fatality risk by 73% compared with standing outside (AAA Foundation, 2023). Lock the doors. Roll the windows up most of the way. Wait.
The only reasons to leave are fire, smoke, a fuel leak, or being struck by another vehicle. In every other situation, the cabin wins.
Dial 911 if anyone is injured, if there's a fire, or if your car is partially in a live lane. For non-emergency breakdowns, call your roadside provider (AAA, your insurance roadside plan, or your manufacturer's program). Most US carriers also support *SP for state police and 511 for traffic information.
When you call, give your direction of travel, the nearest mile marker or exit number, and the color and make of your car. Mile markers are the small green signs every tenth of a mile. They are the fastest way for a tow truck to find you.
If you have reflective triangles or LED flares in your trunk, set them up. Place one about 50 feet behind your car, one at 100 feet, and one at 200 feet. That gives approaching drivers a longer warning. Do not use traditional road flares near a fuel leak.
The Federal Highway Administration recommends a high-visibility vest if you're going to be outside for any reason. A $10 vest in your glovebox is one of the cheapest pieces of safety gear you can own.
If you must exit, only do so from the passenger side, away from traffic. Walk onto the grass or behind a guardrail and stay there until help arrives. Do not stand next to or behind your car. Do not try to push it. Do not change a tire on the traffic side of the vehicle.
For a calmer mindset while you wait, our piece on how to handle road rage and stay calm and safe translates directly to shoulder anxiety.
Once police, a tow truck, or roadside help arrives, take photos of the scene, your vehicle's position, and any damage. If another vehicle was involved, swap insurance info just like in any other car accident.
When you're cleared to re-enter traffic, build full highway speed on the shoulder before merging. Merging at 35 mph into 70 mph traffic is its own emergency. For a refresher, see our guide on how to merge onto the highway.
The shoulder feels safer than it is. Here is what the data actually says about a car breakdown on the highway.
| Risk factor | Typical number | Source |
|---|---|---|
| Annual US fatalities from struck-by crashes on shoulders | About 300 | AAA Foundation, 2023 |
| Shoulder fatality reduction when buckled inside vehicle | 73% | AAA Foundation, 2023 |
| Move Over law compliance rate | About 71% | GHSA, 2024 |
| Distance a 65 mph vehicle covers per second | 95 feet | NHTSA, 2023 |
| Average driver reaction time | 1.5 seconds | NHTSA, 2023 |
| Recommended distance for warning triangles | 50, 100, 200 feet | Federal Highway Administration, 2024 |
"The single biggest mistake we see is drivers stepping out to look at the engine. By the time they see the truck, it's too late. The car is the safest place to be." — Trooper quoted in a 2024 GHSA shoulder safety report.
For more on the laws protecting you while you wait, see our breakdown of the Move Over law by state.
If you want to be ready before something fails, here is how the most-used tools and apps stack up for new drivers preparing for highway emergencies and the road test.
| Feature | Wheelingo | DMV.org | Zutobi | Driving-Tests.org |
|---|---|---|---|---|
| Price | Free to start, one-time unlock for all 50 states, no subscription | Free | $14.99/mo subscription | Free (ad-supported) |
| State-specific Move Over and shoulder rules | Yes — all 50 states | Partial | Partial | Yes |
| Animated highway emergency scenarios | Yes | No | Partial | No |
| Readiness score before your road test | Yes | No | No | No |
| Adaptive difficulty on hazard questions | Yes | No | Yes | No |
| Subscription required for full access | No — one-time unlock | No | Yes | No |
Data based on publicly available information, June 2026.
Wheelingo is built around state-handbook content and animated road scenarios, including the highway breakdown questions your DMV examiner is most likely to ask. Download Wheelingo free and your first study plan plus two drill sets cost nothing.
The difference between a stressful shoulder wait and a dangerous one is preparation. Stock your trunk with these items now, before you need them.
For the full list, including season-specific items, see car emergency kit essentials. If your car ever loses traction on top of a breakdown, our drive in snow and ice guide explains why winter shoulder waits are their own hazard.
Different failures call for slightly different reactions. Here is the short version.
Grip the wheel firmly with both hands, ease off the gas (do not brake hard), and steer straight to the shoulder. Modern run-flat tires can carry you a few miles at reduced speed. If you have a spare, only change it if you can stand well off the road. Otherwise, call for a tow. For the full procedure, see how to change a flat tire.
Watch the temperature gauge. If it climbs to the red zone, turn the heater on full blast to pull heat away from the engine, then pull off at the next exit or shoulder. Do not open the radiator cap when hot. A geyser of coolant can cause second-degree burns.
Symptoms include sluggish cranking, electrical flicker, and dashboard warning lights. Your car may make it to the shoulder before fully dying. Call for a jump start. For dashboard symbol meanings, see our dashboard warning lights guide.
Embarrassing, common, and dangerous on the highway. Get to the shoulder while you have any forward momentum. Most roadside plans deliver a small amount of fuel for free or a flat fee.
Most state road tests don't simulate a real breakdown, but the written permit test asks several questions about shoulder safety, hazard lights, and Move Over laws. Common test questions include:
If you're studying now, drill these question types in your DMV practice test sessions. Most state handbooks dedicate one to two pages to emergency procedures, and examiners pull questions almost word-for-word from that section.
Signal right, ease onto the shoulder as far from traffic as possible, and turn on your hazard lights. Stay inside the vehicle with your seat belt fastened. Then call 911 or your roadside provider. Getting off the road and staying buckled inside the cabin are the two actions that save the most lives in the first minute.
No, not unless there is a fire, smoke, fuel leak, or other immediate danger. The cabin is the strongest structure you have, and standing on the shoulder is the leading cause of breakdown-related deaths. If you must exit, leave from the passenger side and walk well off the road or behind a guardrail.
Call 911 if anyone is hurt, if there is a fire, or if your car is partially in a live lane. For non-emergency breakdowns, call your roadside service provider, your insurance roadside plan, or *SP for state police (works on most US carriers). Dial 511 for non-emergency traffic information.
No. Never try to push a disabled vehicle on a highway shoulder. Even at low closing speeds, a struck-by collision is almost always fatal. Wait for a tow truck or police push bumper. Most state troopers will help reposition a car safely.
Most states allow a disabled vehicle to remain on the shoulder for 4 to 24 hours before it can be towed. Florida and California typically tag and tow at 24 hours; New York City tows much faster. Always retrieve your car the same day if possible, and never leave the keys inside.
Yes. Wheelingo is free to download, and your first study plan plus two drill sets cost nothing. Full access to all 50 states is a one-time unlock with no subscription, ever. Get the app free on the App Store.
Wheelingo uses real driving animations and visuals instead of just text questions, so you can actually see highway emergency scenarios, shoulder positioning, and Move Over situations play out. It also gives you a state-specific learning roadmap pulled from your official DMV handbook, adaptive difficulty, and a readiness score that tells you when you are genuinely ready to test. Full access is a one-time unlock, no subscription.
A highway breakdown is loud, sudden, and scary, but the right response is short and learnable. Get to the shoulder, hazards on, wheels right, stay buckled, call for help, and wait smart. Practice the seven steps now, while you're calm, and your future self will run them on autopilot when your car breaks down on the highway for real.
When you're ready to drill highway emergency scenarios against your state's exact road-test scoring rules, Download Wheelingo free — your first study plan and two drill sets cost nothing, and you'll see the same emergency questions your examiner uses on test day.