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uk Transport & mobility emergencies windscreen crack • cracked windscreen • windscreen chip • stone chip in windscreen • front glass damage • can i keep driving with a cracked windscreen • pulled over to check windscreen • driver view obstructed • windscreen damage zone a • windscreen damage swept area • motorway hard shoulder stop • emergency area stop • roadside safety check • sudden crack while driving • glass crack spreading • crack glare at night • rain worsens visibility • insurance windscreen claim • breakdown recovery decision

What to do if…
your windscreen cracks and you have pulled over safely to check whether you can continue

Short answer

If the crack affects your view of the road, is spreading, or you’re on a motorway/fast road, don’t continue driving—get yourself and the vehicle to the nearest safer place (or arrange recovery).

Do not do these things

  • Don’t carry on driving “to see if it gets worse”.
  • Don’t slam doors, hit kerbs/potholes, or create extra vibration (cracks can run).
  • Don’t blast very hot air onto a cold windscreen (rapid temperature changes can extend cracks).
  • Don’t put anything on the glass that reduces visibility or creates glare (especially in the driver’s viewing area).
  • Don’t inspect the windscreen from the live carriageway, or with your body close to traffic.

What to do now

  1. Make sure your stop is as safe as it can be. Keep hazard lights on. If you’re on a motorway and you can safely reach an emergency area, a lay-by, or a service area, do that instead of staying on the hard shoulder.
  2. Do the only check that really matters: visibility from the driver’s seat. Sit normally and look through the windscreen as you would while driving.
    • If the crack/chip is in your line of sight (you’re tempted to move your head to see around it), treat this as do not continue.
    • If you see distortion, “whitening”, branching lines, or strong glare, assume it will be worse once you’re moving.
  3. Check how likely it is to worsen before you reach somewhere safe. Choose recovery / don’t continue if any apply:
    • The crack is spreading, “spidering”, or heading toward an edge.
    • You’ll face rain, freezing temperatures, bright low sun, or night driving before you can stop again (all can make visibility through a crack much worse).
  4. Use MOT damage criteria as a warning sign (not permission to drive). The MOT visibility check looks for damage:
    • in Zone A (the driver’s main view) over 10mm, or
    • in the remaining swept area over 40mm, and whether the damage significantly affects the driver’s view. If you’re anywhere near these criteria—or unsure—choose the safer option and don’t continue.
  5. If you decide not to continue, switch to “get help and get moved” mode.
    • Contact your breakdown provider and/or insurer (windscreen cover often applies).
    • If you’re on a motorway and feel at risk, use a roadside emergency telephone where available. If you believe you or passengers are in immediate danger, call 999.
  6. If you decide you can continue, make it a short relocation only.
    • Drive only to the nearest safe place off fast traffic (services, a car park, or a repairer), not “the rest of the journey”.
    • Drive smoothly, keep extra distance, avoid bumps, and avoid strong heat aimed at the glass.
  7. Take 2 quick photos and a note. Photo from inside and outside (only if safe). Note time/location and what caused it (e.g., stone strike). This can help with insurance and booking.

What can wait

  • You do not need to decide right now whether it’s a repair or full replacement.
  • You do not need to deal with claim paperwork at the roadside—get safe first.
  • You do not need to attempt a DIY repair while stopped near traffic.

Important reassurance

A sudden windscreen crack can make you feel instantly unsure about safety. Pulling over to reassess was a sensible move. Choosing recovery is a normal, safety-first decision when visibility is even slightly compromised.

Scope note

This guide is first steps only: immediate safety and the decision about whether to continue driving. Longer-term repair choices and cost disputes are outside scope.

Important note

This is general safety information, not legal advice. If you’re unsure whether the crack affects your view, choose the safer option: don’t continue driving and get professional help.

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