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What to do if…
your vehicle breaks down on a high-speed road

Produced and maintained by PanicStation.org Published: Last reviewed: Editorial policy USA guide

Short answer

Turn on your hazard lights and, if the vehicle is still controllable, move gradually to the nearest safe place outside the travel lanes. Call 911 if you are in or close to moving traffic, anyone is injured, or there is fire, smoke, leaking fuel, or another immediate danger.

Do not do these things

  • Do not brake suddenly or make a sharp movement across traffic unless needed to avoid an immediate collision.
  • Do not push the vehicle while traffic is moving around it.
  • Do not attempt a repair or tire change where you or the vehicle would be exposed to moving traffic.
  • Do not stand directly in front of, behind, or beside the vehicle near traffic.
  • Do not walk along the highway or cross traffic lanes to seek help.
  • Do not enter traffic to place flares, triangles, or other warning devices.
  • Do not unbuckle or leave the vehicle without first checking whether there is a clearly safer place you can reach.

What to do now

  1. Turn on your hazard lights. Hold the steering wheel firmly, ease off the accelerator, and slow down gradually while keeping control of the vehicle.

  2. Move to the nearest safe shoulder, exit, rest area, or other place fully outside the travel lanes if you can reach it without a sudden lane change. Stop as far from moving traffic as reasonably possible.

  3. Shift into park, apply the parking brake, and keep the hazard lights on. Keep everyone calm and check for injuries, smoke, fire, leaking fuel, or a strong fuel smell.

  4. Call 911 immediately if any part of the vehicle remains in a travel lane, the shoulder is too narrow to provide reasonable separation from traffic, someone is injured, or there is another immediate hazard. State the road number, direction of travel, nearest exit or mile marker, your position, and the vehicle’s color and type.

  5. If the vehicle is fully outside traffic and there is no immediate hazard, generally remain inside with everyone seated and wearing seat belts while help is arranged.

  6. If remaining inside presents a greater immediate danger and there is a clearly safe route away from traffic, leave through the side farthest from moving vehicles when possible. Move behind a traffic barrier or well away from both the roadway and the vehicle without crossing traffic lanes.

  7. Contact your roadside-assistance provider, insurer, vehicle manufacturer, or a towing service. Tell them your precise location and whether the vehicle is completely outside the travel lanes.

  8. Keep your phone available, remain alert to changing traffic or vehicle conditions, and follow instructions from the 911 dispatcher, law enforcement officers, highway personnel, or roadside responder.

What can wait

You do not need to diagnose the mechanical problem, choose a repair shop, decide how the rest of the journey will work, retrieve nonessential belongings, or contact everyone now. First make your position as safe as possible and arrange appropriate help.

Important reassurance

A breakdown on a high-speed road can feel overwhelming, but you do not need to repair the vehicle yourself. Making the vehicle visible, avoiding live traffic, sharing an accurate location, and waiting for trained help are useful immediate steps.

Scope note

This guide covers immediate safety and help-seeking steps only. Towing, repairs, insurance, replacement transport, and later decisions may require help from a qualified roadside provider, mechanic, insurer, or relevant authority.

Important note

This is general safety information, not legal, emergency-response, or mechanical advice. Road layouts, traffic, weather, vehicle condition, and state procedures vary. Follow instructions from emergency dispatchers and responders at the scene.

Additional Resources

Closely connected guides that may be useful during the same situation or its immediate aftermath.

About this guide

This guide was produced and is maintained by PanicStation.org using its published editorial process. Official and specialist sources are checked where relevant, and AI-assisted tools may be used for drafting, organisation, and consistency checks. The site operator remains responsible for publication, revision, and removal decisions.

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