Windscreen Laws in the UK
It can be considered as a motoring offence to drive with a damaged windscreen. If stopped, you could be fined and receive 3 penalty points on your license for driving a car in a dangerous condition.
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Is it OK to drive with a cracked windscreen?You should avoid driving your vehicle if it has a cracked windscreen, as it could increase the chances of a car accident.
Is it OK to drive with a cracked windshield?
It's generally not dangerous to drive with a small crack in the windshield, but damaged glass should be repaired or replaced as soon as possible for two important reasons: Windshields weakened by damage provide less protection. Cracked windshields decrease visibility.
Is a crack in a windscreen an MOT failure?
Windscreens and the MOT test
Your car may fail its MOT if: The windscreen is chipped or cracked. The maximum damage size is 10mm in the drivers' line of vision (a vertical strip 290mm wide centred on the steering wheel), 40mm elsewhere in the rest of the area swept by the wiper blades.
How long can a cracked windshield last?
There is no set amount of time to safely drive with a cracked windshield. In some cases, the crack is diminutive and unlikely to spread, making it possible to drive days, weeks or even months without additional damage. However, even slight cracking makes windshields brittle.
Changes in Temperature
When this happens, your windshield's structure tends to shift, thus weakening the corner of each crack or chip. In one day, these cracks will start spreading on a microscopic level. Within a few days, you will see marked differences in the crack with the naked eye.
You should avoid driving your vehicle if it has a cracked windscreen, as it could increase the chances of a car accident.
Covering the crack as such with the help of tape can add a protective barrier and ensure that moisture or dirt does not cause the crack to spread further. It's recommended that you use a clear tape for the application. You can also use a duct tape if the location of crack does not impede with your visibility on road.
Cracked windshields not only reduce the aesthetic appeal of your vehicle, but also reduce visibility on roads while you're driving. These cracks usually spread over time—if not tended to. This makes your car unsafe to drive, especially if the chip is more than 12 inches long.
Spread Nail Polish on the Crack
Like superglue, clear nail polish can serve as a temporary fix to stop a windshield crack from spreading while you're on the go. And, like superglue, nail polish can be highly difficult to remove once it's been applied.
Another important factor is the location of the crack. If the crack hinders the view as you drive the car, you should have it repaired right away. However, if the crack is small and on the passenger side, you could possibly drive for hundreds of miles without any issue.
As a general rule, if you have any cracks – or even chips – in your windscreen that are bigger than 10mm and are in the A-Zone (which is a 290mm area directly in front of the driver), your car will fail its MOT. A crack or chip bigger than 40mm anywhere else on your windscreen will also result in a fail.
Best practice is to repair the chip or crack as swiftly as possible. Even if the damage is not in your line of vision, don't put off the repairs – a crack left unattended can quickly spread across the windscreen. A chip could be repaired by injecting an epoxy or acrylic adhesive into it.