Your Windscreen & The MOT: Pass or Fail?

Putting your car through its annual MOT test can often feel like a nerve-wracking ordeal. Beyond the general anxiety of potential repair costs and the inconvenience of being without your vehicle, specific concerns can loom large for many drivers. One such worry, surprisingly common yet frequently misunderstood, revolves around the condition of your car's windscreen. Minor damage, such as a pesky chip or a hairline scratch, might seem insignificant, but could it genuinely jeopardise your car's chances of passing its MOT?

Here at Redrose Windscreens, we understand these anxieties. As Preston's favoured windscreen repair specialists, we've seen countless vehicles come through our doors with queries about MOT compliance. This comprehensive guide aims to demystify the regulations surrounding windscreen damage and the MOT test, providing clarity on what's acceptable, what constitutes a failure, and how to ensure your vehicle is in prime condition for inspection.

Understanding the MOT Windscreen Regulations: What Constitutes a Fail?

The primary concern regarding your car's windscreen during an MOT is clear and unobstructed visibility for the driver. Any damage that compromises this vital aspect can, and often will, lead to a test failure. The rules are quite specific, focusing on both the type and size of the damage, as well as its precise location on the windscreen.

Currently, several types of windscreen damage are meticulously scrutinised during an MOT. These include:

• Chips: Small impact points that create a pit or a small fracture.
• Scratches: Linear abrasions on the glass surface.
• Cracks: More significant fractures that spread across the glass.
• Anything stuck to the windscreen: This can include items like sat-nav mounts, phone holders, or even unapproved stickers that obscure the driver's view.

However, it's crucial to understand that not all damage automatically results in a fail. The key determinants are the size of the damage and, critically, its location relative to the driver's line of sight.

The Critical 'Driver's Forward Facing Vision' Area (Zone A)

The most stringent rules apply to a specific section of the windscreen known as the 'Driver's Forward Facing Vision' area, often referred to as Zone A. This is the most crucial part of the windscreen, directly in the driver's line of sight, where even minor imperfections can significantly impair visibility and, consequently, road safety.

Zone A is defined as a vertical strip, 30 cm wide, centred on the steering wheel and extending from the bottom of the windscreen to the top. This area is where the driver requires an absolutely clear and unimpeded view of the road ahead. Within this critical 30 cm zone, any chip, crack, or scratch that is larger than 10mm in diameter will unequivocally lead to an MOT failure.

For damage located outside of this designated Zone A, the rules are slightly more lenient. If your cracks, chips, or scratches are situated anywhere else on the windscreen (i.e., outside the 30 cm driver's vision area), the problematic area needs to be larger than 40mm in diameter to cause your car to fail an MOT test. While 40mm might seem like a substantial size, it's still surprisingly easy for minor damage to grow and exceed this limit over time, especially with temperature fluctuations or further impacts.

The Nuance of Windscreen Damage: Size and Location Matter

To help illustrate these critical distinctions, the following table provides a clear overview of how different types of damage, depending on their location and size, are likely to impact your MOT outcome. It's a quick reference guide to assess your windscreen's readiness.

It's important to note that even if damage falls within the 'likely pass' criteria, it is always advisable to address it promptly. Small chips and cracks have a notorious tendency to spread, especially when exposed to temperature changes, road vibrations, or even the force of a car wash. A minor issue today could quickly become a costly replacement or an MOT failure tomorrow.

The Verdict on Repaired Windscreens

A common question arises concerning windscreens that have previously undergone repairs. Does a repaired windscreen get a free pass, or is it scrutinised just as rigorously? The answer is clear: if you have had your windscreen repaired in the past, it will still be tested to the exact same standards as an un-repaired windscreen. The repair itself must not compromise the driver's visibility in any way.

This means that the repair needs to continue to allow for unobstructed vision and must meet specific quality criteria. An MOT inspector will assess the repair to ensure it is:

• Barely detectable: The repair should be almost invisible, integrating seamlessly with the surrounding glass. Any significant distortion or discolouration will be problematic.
• Flush to the rest of the glass: The repaired area should be smooth and level with the original glass surface, without any raised or depressed areas.
• See-through: Crucially, the repaired section must be completely transparent, allowing for clear vision without any haziness, refraction, or light scattering.

If your windscreen repair is not of top quality, or if it has deteriorated over time, you run a significant risk of failing your MOT test. A poorly executed or aged repair can be just as detrimental to visibility as un-repaired damage, sometimes even more so if it causes light distortion.

Beyond the Glass: Other Visibility Checks During an MOT

While the windscreen itself is a major focus, the MOT also encompasses other elements crucial for the driver's visibility and overall road safety. A problem with any of these components can also lead to a failure, even if your windscreen is pristine:

• Wiper Blades: Both front and rear wipers must operate effectively, clearing the screen fully without smearing, streaking, or leaving uncleared areas. Split or perished rubber blades are a common cause of failure.
• Windscreen Washers: The washer jets must operate correctly, spraying fluid onto the windscreen in a way that allows the wipers to clean the glass effectively. An empty washer fluid reservoir will also result in a fail.
• Rear-view Mirror and Side Mirrors: All mirrors must be securely fitted, provide an adequate view to the rear and sides, and not be cracked or damaged to an extent that impairs their function.
• Windscreen Tinting: Any tinting applied to the windscreen must comply with legal light transmission requirements. Excessive tinting can reduce visibility, particularly in low light conditions.

Ensuring all these components are in good working order is part of a thorough pre-check and contributes significantly to your vehicle's overall MOT success and, more importantly, your safety on the road.

Proactive Steps: Ensuring Your Car is MOT-Ready

The best defence against an MOT failure due to windscreen damage is proactive maintenance and inspection. A few simple steps before your scheduled test can save you a lot of hassle, stress, and potentially significant repair costs:

• Thoroughly Clean Your Windscreen: Inside and out. A dirty windscreen can obscure minor damage or make it appear worse than it is. Ensure there are no streaks or smudges.
• Inspect for Damage: Take a few minutes to carefully examine your windscreen. Look for chips, cracks, and scratches, paying particular attention to the Zone A area. Run your fingers over the glass to feel for imperfections.
• Check Wiper Blades: Lift your wiper blades and inspect the rubber for any signs of perishing, splitting, or hardening. Replace them if they show signs of wear.
• Top Up Washer Fluid: Ensure your washer fluid reservoir is full and that the jets spray effectively onto the screen.
• Remove Obstructions: Take off any temporary sat-nav mounts, phone holders, or non-essential stickers that might be in the driver's line of sight.

If you identify any damage that falls within the MOT failure criteria, or if you're unsure, do not delay. Contacting a professional windscreen repair company like Redrose Windscreens well in advance of your MOT can make all the difference. Addressing a chip early is almost always much cheaper and quicker than waiting for it to become a full-blown crack requiring a costly windscreen replacement.

What Happens If Your Car Fails?

Should your car fail its MOT test due to windscreen damage or any other issue, you will be issued a 'refusal of an MOT test certificate'. This document outlines all the 'dangerous' and 'major' defects found. Driving a vehicle that has failed its MOT with 'dangerous' defects is illegal and can result in severe penalties, including fines and points on your licence. For 'major' defects, you can usually drive the car to a pre-booked appointment for repairs, but not simply use it as normal.

You will then need to get the necessary repairs done. Once repaired, the vehicle will need a retest. Depending on the type of retest and how quickly it's done, it might be free or incur a partial fee. The financial implications of an unexpected MOT failure can be significant, reinforcing the importance of preventative checks.

Frequently Asked Questions (FAQs)

Q1: Can a small chip really fail my MOT?

A: Yes, absolutely. If a chip is located within the 30 cm wide 'Driver's Forward Facing Vision' area (Zone A) and is larger than 10mm in diameter, it will cause an MOT failure. Even if it's smaller, it could be noted as an advisory if it impacts visibility.

Q2: My crack is really thin; will it pass the MOT?

A: Thin cracks are often more problematic than chips, as they can spread quickly and significantly distort vision. If the crack is in Zone A, any size is likely to be an MOT failure, as it severely compromises the structural integrity and optical clarity required. Outside Zone A, a crack larger than 40mm will fail. It's always best to get cracks professionally assessed immediately, regardless of their apparent size.

Q3: What if I have a sticker or a sat-nav mount on my windscreen?

A: Any item stuck to the windscreen that obstructs the driver's view can lead to an MOT failure. This is particularly true if it's within Zone A. It's advisable to remove any non-essential stickers, sat-nav mounts, or phone holders from the windscreen before your MOT to avoid any issues.

Q4: How long does a windscreen repair typically take?

A: The duration depends on the type and extent of the damage. A chip repair can often be completed in as little as 30 minutes. A full windscreen replacement, while more involved, can typically be done within a few hours. Always consult a professional for an accurate time estimate.

Q5: Is it cheaper to repair a chip or replace the entire windscreen?

A: Repairing a chip is almost always significantly cheaper and quicker than a full windscreen replacement. If the damage is suitable for repair (generally smaller chips, not cracks, and not too close to the edge of the glass), it's the most cost-effective solution. Addressing damage early can save you substantial costs and inconvenience down the line.

In summary, while the MOT test can be a source of anxiety, being well-informed about the regulations, especially concerning windscreen damage, can significantly ease your worries. The condition of your windscreen is paramount not only for passing your MOT but, more importantly, for your safety and the safety of others on the road. Don't leave it to chance; a quick pre-check and professional assessment if needed can ensure your car is roadworthy and ready to pass with flying colours.

If you want to read more articles similar to Your Windscreen & The MOT: Pass or Fail?, you can visit the MOT category.