A cracked windscreen is a common problem for UK drivers. Whether it’s caused by a stone chip on the motorway or damage from extreme weather, many motorists wonder if it’s legal and safe to continue driving.
The short answer is: it depends on the size and location of the crack.
In some situations, driving with a cracked windscreen could be dangerous and may even lead to legal issues.
Is It Illegal to Drive With a Cracked Windscreen?
There is no specific law that says any crack automatically makes a vehicle illegal to drive.
However, drivers must ensure they have a clear view of the road at all times.
If a crack obstructs your vision or makes the vehicle unsafe, you could be stopped by the police and required to repair the damage.
When Does a Cracked Windscreen Become Dangerous?
A windscreen does much more than keep the rain out.
It helps:
- Support the structure of the vehicle
- Protect occupants during a collision
- Assist with airbag deployment
- Provide clear visibility of the road ahead
A crack can weaken the glass and spread unexpectedly, especially during cold weather or when driving over bumps.
Can You Fail an MOT Because of a Cracked Windscreen?
Yes.
A cracked windscreen can result in an MOT failure depending on the size and position of the damage.
Cracks located directly in the driver’s line of sight are treated particularly seriously because they can affect visibility and road safety.
This is why it’s always worth having chips repaired before they develop into larger cracks.
What Causes Windscreen Cracks to Spread?
Many drivers are surprised by how quickly a small chip can become a large crack.
Common causes include:
- Temperature changes
- Driving over potholes
- Slamming car doors
- Vehicle vibrations
- Existing weakness in the glass
A repair that might have been inexpensive can quickly turn into a full windscreen replacement if left too long.
Should You Repair or Replace It?
In many cases, a small chip can be repaired by a professional without replacing the entire windscreen.
However, replacement is often required when:
- The crack is large
- The damage affects visibility
- The crack continues to spread
- The structural integrity of the glass is compromised
A professional inspection can determine the best option.
Tips for Drivers
If you notice a crack in your windscreen:
- Get it checked as soon as possible.
- Avoid extreme temperature changes where possible.
- Don’t ignore small chips.
- Monitor the damage regularly.
- Arrange repairs before your MOT if necessary.
Final Thoughts…
Driving with a cracked windscreen isn’t always illegal, but it can quickly become a safety issue. Small chips and cracks can spread without warning, affecting both visibility and the strength of the vehicle.
If you’re unsure whether your windscreen is safe, it’s always best to have it inspected by a professional before the damage gets worse.