Can You Drive with a Broken or Cracked Number Plate in the UK?

No, you cannot legally drive with a broken or cracked number plate in the UK. A damaged plate that obscures any character, fails to reflect light correctly, or is not securely fixed to the vehicle does not meet the requirements of BS AU 145e and will fail an MOT. This guide explains exactly when a cracked plate becomes illegal, what the risks are, and what to do about it.

When does a damaged plate become illegal?

A number plate becomes non-compliant as soon as the damage affects any of the following:

• Legibility — any crack, break, or discolouration that makes a character harder to read is a legal issue
• Reflectivity — BS AU 145e requires plates to reflect light within specific parameters; a cracked or yellowed plate may no longer meet this standard
• Security of fixing — a plate that is bent, loose, or partially detached from the vehicle does not meet the secure fitting requirement
• Background colour — yellowing or significant discolouration on the rear plate changes the required yellow background

A hairline crack that does not affect any of the above may technically be acceptable at an MOT, but it is the tester’s discretion. Any doubt means a replacement is the safer choice.

Will a cracked number plate fail an MOT?

Yes, if the damage affects legibility, reflectivity, or fixing security. MOT testers are required to check plates at every test. Our full guide on what MOT testers check on number plates covers every criteria they assess. A cracked plate that makes any character difficult to read will be a direct failure.

Can you be fined for a cracked number plate?

Yes. Police and DVSA officers can issue a fine of up to £1,000 for a non-compliant plate at any point, not only at an MOT. An ANPR camera that cannot read a damaged plate may also flag your vehicle for a police stop. See our guide on number plate fines in the UK for the full picture on penalties.

What if the plate is cracked but still readable?

Even if you feel the crack does not affect legibility, a visibly broken plate puts you at risk of a roadside fine at the officer’s discretion. Replacement plates are inexpensive — standard plates start from £6.99 at Car Plates Pro, with same-day dispatch on orders before 2PM. The risk of a £1,000 fine is not worth it.

How to get a replacement plate quickly

Order before 2PM and your plates are dispatched the same day, arriving the next working day. Use the number plate builder to order road-legal replacement plates. All plates are BS AU 145e certified, built from 5mm acrylic with Charles Wright 2001 font. Free sticky pads included with every order.

For a full guide on costs, see how much replacement number plates cost in the UK.

Summary

A cracked or damaged number plate is illegal if it affects legibility, reflectivity, or fixing security. It will fail an MOT and can result in a roadside fine of up to £1,000. Replacement plates start from £6.99 with same-day dispatch. Do not wait for the MOT — order your replacement plates now.