Vehicle emergency kit

AAA responds to roughly 32 million calls per year in the United States, and the top three causes — dead batteries, flat tires, and keys locked inside — are all solvable without outside help if you have the right kit. The goal of a vehicle emergency kit isn't to replace roadside assistance for everything. It's to handle the common failures independently, keep you safer during the wait for the uncommon ones, and sustain you if the failure happens during an evacuation when roadside assistance response times collapse.

The kit lives in your vehicle permanently, takes up roughly the space of a duffel bag, and earns its keep the first time you use it.

Breakdown tools

Jump starter (lithium power bank style): Modern lithium jump starters in the 1,000–2,000 peak amp range start gas engines up to 6L and diesel engines up to 3L, weigh 2–3 lbs (0.9–1.4 kg), and charge from a USB-C port. A quality unit holds its charge for 6–12 months on a shelf. Check charge every 3 months and top off annually. Older jumper cable designs require a second vehicle — the lithium jump starter works alone at 3 a.m. with no one around. For larger vehicles (trucks over 6L, large diesel SUVs), a higher-capacity unit in the 2,000–4,000 peak amp range handles the task.

Tire inflator: A 12V tire inflator that plugs into the accessory socket (formerly the cigarette lighter) inflates a standard passenger tire from flat to 35 PSI (241 kPa) in 3–8 minutes depending on the unit. Models with a digital gauge and auto-shutoff at a set pressure prevent overinflation. For a slow leak, this buys enough time to reach a tire shop. For a complete flat, it works only if the tire isn't severely damaged — you'll still need the spare for a blowout.

Tire pressure gauge: A quality dial or digital gauge accurate to ±1 PSI (±7 kPa) takes seconds to use and catches underinflation before it becomes a blowout. The NHTSA estimates underinflated tires contribute to roughly 660 traffic fatalities per year. A gauge stored in the glove box costs very little and has no moving parts to fail.

Spare tire, jack, and lug wrench: Most vehicles ship with these. Verify yours is present, the spare has adequate pressure (check every 6 months — spares lose pressure slowly), and the jack is rated for your vehicle's weight. A 4-ton hydraulic floor jack ($40–60 USD range) provides more stable lifting than the factory scissor jack for heavier vehicles or soft ground. Include a 12-inch (30 cm) square of 3/4-inch (19 mm) plywood as a jack base for soft ground, gravel, or grass shoulders.

Lug nut socket and breaker bar: Factory lug wrenches are often too short to generate enough torque to break loose over-tightened lug nuts. A 1/2-inch drive breaker bar with the correct socket for your lug nuts (most passenger vehicles use 17 mm, 19 mm, or 21 mm) provides 3–4x the torque of the factory tool. A 24-inch (61 cm) breaker bar with a length of metal pipe as a cheater bar handles nearly any lug nut.

Basic tools: A compact kit for roadside use doesn't need to be comprehensive. A 10-piece set covering the most common needs: adjustable wrench, needle-nose pliers, wire cutters, flat and Phillips screwdrivers, electrical tape, duct tape, zip ties, and a pocketknife or multitool. These handle the practical failures: a loose battery terminal, a knocked-off splash guard, a chafed wire.

Safety and visibility

Road flares or LED safety lights: Three is the standard for protecting a stopped vehicle. Position the first 10 feet (3 m) behind the vehicle, the second 100 feet (30 m) back, and the third at 300 feet (91 m) on a highway. Pyrotechnic flares burn for 15–30 minutes and are highly visible in rain and fog. LED road safety lights are reusable, last indefinitely on a charge, and eliminate the risk of setting roadside vegetation on fire. Keep both: LED for routine use, one pyrotechnic flare for extreme weather visibility.

Reflective safety vest: ANSI Class 2 vests are required for roadside workers in many states. Wearing one while changing a tire in low light conditions dramatically reduces your profile against traffic. Weighs 4 oz (113 g), stores flat, costs very little.

Work gloves: A pair of cut-resistant work gloves protects against sharp metal, broken glass, and hot engine components. Keep them in the kit rather than your garage.

Traffic is the primary danger

More people are killed by passing traffic during roadside stops than by the mechanical failure that caused the stop. When possible, exit off the road entirely. If you must work on the shoulder, position safety devices at the distances above, wear the reflective vest, and stand on the road-away side of the vehicle whenever possible.

Survival supplies

A vehicle kit that only covers mechanical failures isn't adequate for the scenarios where it matters most: being stranded during extreme weather, during a regional emergency that delays rescue, or during an evacuation with a disabled vehicle.

Water: 1 gallon (3.8 L) per person in the vehicle, minimum. Sealed commercial water bottles in 1-liter sizes stack efficiently. Rotate every 6 months in hot climates where storage temperature accelerates plastic off-gassing. In winter, store water in an insulated bag or it will freeze solid.

Food: Energy bars or packaged food with a minimum 1-year shelf life, enough for 1,200–2,000 calories per person. This is a one-day emergency buffer, not a survival larder. Rotate on the same schedule as the water.

First aid kit: A vehicle first aid kit should exceed the basic 50-piece retail kits, which contain mostly small bandages. Add: one tourniquet (CAT or SOFTT-W, stored in an accessible location — not buried in the kit bag), trauma dressings for wound packing, a cardiopulmonary resuscitation (CPR) face shield, and any personal prescription medications. See the IFAK build page for a full component list.

Thermal blanket: A mylar emergency blanket weighs 2 oz (57 g) and reflects 90% of body heat. In a broken-down vehicle in winter, it's the difference between shivering and hypothermia over a 4-hour wait. A full-size wool or fleece blanket is more comfortable for longer waits.

Flashlight and headlamp: A magnetic-base LED work light attaches to the engine compartment for hands-free mechanical work. A headlamp keeps hands free for tire changes and interior inspections. See emergency lighting for battery and runtime guidance. Keep lithium batteries in vehicle-stored lights — alkalines lose capacity rapidly in hot and cold temperature extremes.

Phone charger: A 12V-to-USB adapter and a 6-foot (1.8 m) charging cable with the correct connector for your phone. Alternatively, a USB power bank (10,000–20,000 mAh) lets you charge away from the vehicle if you've had to leave it.

Paper map: For your region and likely travel routes. GPS fails when the phone battery dies, when cell service is out, or when regional infrastructure is disrupted. A paper map never fails.

Winter additions

Cold-weather driving adds a separate failure layer. A vehicle kit for winter use in climates that see snow and ice needs:

Ice scraper and snow brush (telescoping, 42 inches / 107 cm minimum for SUVs and trucks)
Bag of sand or kitty litter (10–20 lbs / 4.5–9 kg) for traction under spinning tires
Tow strap or recovery strap — 20-foot (6 m), 30,000 lb (13,600 kg) rating minimum for most passenger vehicles. A kinetic recovery strap (not a tow chain) absorbs shock load and protects both vehicles in a pull
Collapsible shovel — a military surplus entrenching tool or a compact folding shovel handles digging out from a snow bank or clearing packed snow from wheel wells
Extra thermal layer — a sleeping bag rated to 0°F (-18°C) or lower, stored in the vehicle, provides emergency warmth if you must shelter in place for hours

Field note

The collapsible shovel is the item most vehicle owners wish they had after a winter breakdown. A 3-inch (8 cm) snowfall that traps a vehicle in a drainage ditch takes 10 minutes to dig out with a shovel — and 3 hours to wait for a tow truck. Keep the shovel accessible, not buried under other kit.

Storage and organization

The kit needs to be accessible, not just present. A rolling duffel bag in the trunk works for most vehicles. A dedicated hard-sided plastic tote with handles organizes contents and protects from moisture. For SUVs and trucks, a fitted cargo organizer with dividers keeps everything from sliding.

Organize in layers of urgency: 1. Top layer (immediate access): flashlight, reflective vest, road flares 2. Middle layer (short-task tools): jumper cables or jump starter, tire inflator, basic tools 3. Bottom layer (sustained use): water, food, blanket, first aid kit

Label the bag visibly so any passenger can locate items in an emergency. If the kit will be accessed by multiple drivers, walk each one through the contents annually.

Maintenance schedule

A vehicle kit that hasn't been audited in 18 months has probably expired food, a discharged jump starter, and a flat spare tire. Set a recurring reminder:

Every 3 months: Check jump starter charge; top off if below 50%
Every 6 months: Inspect spare tire pressure; rotate food and water; test flashlight batteries
Annually: Full audit — verify all items present, check expiration dates, replace any expired flares or first aid supplies

Checklist

Your vehicle kit covers the mobile layer of preparedness. It dovetails with your bug-out bag for situations where you leave the vehicle on foot, and with your navigation plan for the routes you're most likely to travel under emergency conditions.