How to prepare for a car emergency
Most roadside emergencies become dangerous because of what people do next. What belongs in the trunk, where to wait and when staying put is the safer call.
A car emergency is rarely the breakdown. A flat tyre on a shoulder is an inconvenience; standing beside that tyre in the traffic lane is one of the most dangerous things a person can do on an ordinary day. Being stuck in snow is survivable; walking away from the vehicle to find a house often is not.
So the preparation is in two halves: what is in the trunk, and what the rules are for the first five minutes.
What belongs in the trunk, permanently
| Category | Items |
|---|---|
| Being seen | Reflective triangles, hi-vis vest, flashlight with spare batteries |
| Getting going | Jump starter, tyre inflator or sealant, jack and wrench that fit, tow strap |
| Staying alive | Water, non-perishable food, wool blanket, first aid kit |
| Information | Phone power bank and cable, paper map, insurance and breakdown numbers written down |
| Getting out | Seatbelt cutter and window breaker within reach of the driver — not in the trunk |
Seasonal additions matter: a shovel, sand or traction mats and warm layers in winter; extra water and sun protection in summer. The full trunk kit.
Breaking down: the first five minutes
- Get off the roadway if the vehicle still moves. A moving car on the shoulder is far safer than a stopped one in a lane.
- Hazards on immediately, and triangles behind the vehicle at a distance that gives approaching traffic time.
- Everyone out on the passenger side, and behind a barrier if there is one. Do not sit in the car on a highway shoulder, and do not stand between your vehicle and traffic.
- Call for help before you start trying to fix anything. Roadside assistance while you are safe is better than a repair while you are exposed.
- Do not change a tyre on the traffic side. If it is that side, wait for help. If you break down.
Stranded: why staying is usually right
A vehicle is shelter, a windbreak, a signal and something searchers can find. Walking trades all of that for uncertainty, and in snow or heat it is the most common fatal decision.
- Stay unless help is close, certain and safely reachable on foot.
- Make the vehicle visible — hazards, a bright cloth on the aerial, dome light at night if the battery allows.
- In snow: clear the exhaust pipe before running the engine, and run it in short intervals rather than continuously. Blocked tailpipes push carbon monoxide into the cabin.
- In heat: get out of the vehicle into shade if there is any. A parked car in the sun becomes hotter than the outside air within minutes.
- Ration water, insulate, and move a little periodically to keep circulation going. Trapped in a vehicle.
Water is the one that changes the rules
The staying-with-the-vehicle rule reverses for flooding. If water is rising around the car, get out immediately and move to higher ground on foot, away from the flow. A vehicle floats in about a foot of moving water and is carried away in two — and it is the most common place that flood deaths happen.
Never drive into standing or moving water. You cannot see whether the road surface is still under it, and after a flood it frequently is not. Why you never cross a flooded road.
Before any long or remote drive
Check tyres including the spare, fluids and lights. Fuel above half. Tell someone the route and the expected arrival time — that single message is what turns a breakdown in poor coverage into a search that starts on the right road instead of a day later.
The ZonaProtec monitor shows official warnings in effect at a point you search, which is worth checking before setting off rather than after.
Guides
- What to do if you are trapped in your car by snow or water Two opposite situations with opposite rules: in snow you wait inside, in water you get out immediately. How to handle each one.
- What to do if your car breaks down on the road Where to stop, whether to stay inside or get out, how to be seen, and why walking for help is usually the worst decision.
- What to always keep in your car emergency kit A kit that fits in one box and covers everything from a night-time breakdown to being stuck in snow. What stays all year and what changes by season.
Gear that covers this
Products that match what the guide above recommends.
Affiliate disclosure: As an Amazon Associate we earn from qualifying purchases. This does not change the price you pay or the recommendations we make.
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Jump starter with air compressor
It covers the two most common failures — a flat battery and a flat tyre — without needing another vehicle or another person.
- View on Amazon
Reflective triangles and a hi-vis vest
Being seen is the whole safety problem at the roadside, and headlights alone do not do it in rain or at dusk.
- View on Amazon
Wool blanket and hand warmers
A stuck vehicle in winter becomes survivable or not based on insulation, not on the heater.
Frequently asked questions
Should I stay in the car or walk for help?
In almost every case, stay. A vehicle is shelter, it is visible, and it is what searchers look for. Walking is only reasonable when help is close, certain and reachable safely on foot — and in snow or heat it is how people die.
Where do I wait if I break down on a highway?
Not in the driver's seat and not on the traffic side. Get everyone out through the passenger-side doors and behind the barrier, well up the embankment and behind the vehicle. Being struck by passing traffic is the main cause of death in roadside breakdowns.
How much fuel should I keep in the tank?
Above half through winter and before any long or remote drive. Fuel is heat, and the difference between a stuck vehicle that is uncomfortable and one that is dangerous is usually how much of it is left.
Is it safe to run the engine while stuck in snow?
Only in short intervals and only after clearing the exhaust pipe. Snow blocking the tailpipe pushes carbon monoxide back into the cabin, and that is the recurring cause of death in vehicles buried by snow.