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uk Transport & mobility emergencies

What to do if…
your headlights or rear lights are not working before you drive at night

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

Short answer

Do not set off at night if your dipped headlights, rear position lights, or rear registration plate light are not clearly working. Stay parked somewhere safe, make the stationary car visible if needed, and arrange another way to travel or get help.

Do not do these things

  • Don’t assume daytime running lights mean your rear lights are on.
  • Don’t use sidelights or parking lights as a substitute for proper headlights at night.
  • Don’t drive “just a short distance” on public roads with required lights not working.
  • Don’t keep testing switches while moving; do checks while stationary.
  • Don’t let someone stand in the road behind the car to check lights in traffic or poor visibility.
  • Don’t do roadside electrical work in traffic, darkness, or bad weather.

What to do now

  1. Make a safe pause first.
    Stay parked if you have not set off. If you are already stopped somewhere exposed, use hazard warning lights while stationary if they work, and move the vehicle out of a live lane only if you can do that safely.

  2. Switch the lights on manually.
    Turn the lighting control to ON or dipped headlights, not Auto. Check the dipped headlights, rear position lights, brake lights, indicators, hazard warning lights, and rear registration plate light. Check main beam only if it will not dazzle anyone.

  3. Check the rear of the car, not just the dashboard.
    Walk around in a safe place, or ask someone to check from the pavement or another safe spot. Confirm that the rear lights and rear registration plate light are actually lit.

  4. Look for the simple pattern, but do not rely on it as a diagnosis.
    One failed headlight or one failed rear lamp may be a bulb or light unit issue. Both headlights out, both rear lights out, or several lights failing together may be a fuse, switch, relay, or electrical fault. If the required lights are not working, treat the car as not safe for a night drive.

  5. Only try a simple fuse or bulb check if it is safe.
    Use the owner’s manual. If the relevant lighting fuse is easy to reach and you have the correct spare, replace it only with the same rating. If you are not confident, do not have the correct part, or the lights do not work immediately, stop trying and arrange help.

  6. Change the travel plan.
    Use a taxi, public transport, a lift, or wait until daylight. Do not move the car on public roads at night unless the required lights are working.

  7. If you are away from home, arrange recovery or repair.
    Contact your breakdown provider, a garage, or someone who can collect you. If you are beside a road, move away from traffic if it is safe to leave the vehicle; if leaving the vehicle is not safe, stay belted in while you arrange help.

What can wait

  • You do not need to diagnose the exact electrical fault tonight.
  • You do not need to decide whether it is a bulb, fuse, wiring, alternator, or control module issue right now.
  • You do not need to book a full inspection this minute.
  • You do not need to finish the journey in that car tonight.

Important reassurance

Noticing a lighting fault before setting off is the useful moment: you still have time to stop, check, and choose a safer plan. A delayed journey is less risky than discovering the problem on a darker or faster road.

Scope note

These are first steps only. Repair may need a mechanic, breakdown patrol, or garage, especially if more than one light has failed or a replacement fuse does not solve the problem.

Important note

This is general safety information, not legal advice or a substitute for a mechanic’s inspection. If you are unsure whether the required lights are working correctly, treat the car as not safe for a night drive and use another option.

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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