Windshield Pitting & Night Glare: Causes & Fix
If oncoming headlights explode into a blinding starburst on your evening commute, the culprit is often windshield pitting and the night glare it creates. Over years of highway driving, countless tiny impacts from sand, grit, and road debris sandblast the glass, leaving thousands of microscopic pits. By day you barely notice them; at night, every pit scatters light from oncoming headlights and streetlamps into a haze that makes the road harder to read. This article explains what pitting is, why it causes glare, whether it can be fixed, and why Calgary's gritty winters make it especially common.
What exactly is windshield pitting?
Pitting is the accumulation of tiny chips and craters across the surface of your windshield, far smaller than a rock chip. Each one is a microscopic crater blasted into the glass by:
- Winter road sand and gravel
- Highway debris at speed
- Years of dust and grit dragged across by wipers
Individually they're invisible. Collectively, they turn a once-smooth, optically clear surface into a frosted, light-scattering one. Unlike a single rock chip, pitting is spread across the whole glass — which is why it can't be spot-repaired.
Why does pitting cause such bad night glare?
A clear windshield lets light pass straight through. A pitted one is covered in thousands of tiny irregular surfaces, and each pit refracts and scatters incoming light in random directions. At night, when a bright point source like a headlight hits all those pits, the light blooms outward into a starburst or halo instead of staying a clean point. The result is glare, halos, and reduced contrast exactly when you most need to see clearly.
Drivers often describe it as: fine in daylight, miserable at night, and worse in rain when water films over the pits. If this sounds familiar, it may be time to assess the glass. Get a free windshield assessment in Calgary.
Can windshield pitting be repaired or polished out?
This is the question that disappoints people: pitting generally cannot be repaired. Here's why:
- Polishing risks distortion. Aggressive glass polishing removes material unevenly and can create optical waviness that's as bad as the pitting — or worse, since the windshield is in your direct line of sight.
- It's surface-wide. Resin fills a single chip, but you can't resin-fill thousands of microscopic pits across the whole pane.
- Safety and clarity standards. The windshield is a safety-critical optical surface, and DIY polishing kits rarely restore true clarity.
When pitting is bad enough to cause dangerous night glare, replacement is the reliable fix. A new windshield restores a smooth, optically clear surface and your night vision with it.
How do I know if it's pitting and not a dirty windshield?
Clean the glass thoroughly inside and out, including any wiper film and road haze. If the glare persists after a proper clean — especially at night facing headlights — you're likely looking at pitting in the glass itself rather than surface grime.
Why is pitting so common on Calgary windshields?
Calgary drivers see more pitting than most, and winter is the main reason. Road crews sand and gravel the roads heavily for traction, and on high-speed routes like Deerfoot Trail and Stoney Trail that grit gets flung at your windshield for months. Add a long commute and several winters, and the cumulative sandblasting adds up fast. The same gravel trucks that cause rock chips also contribute a steady spray of fine debris that pits the glass over time.
When should I replace a pitted windshield?
Consider replacement when pitting causes:
- Dangerous starbursts or halos from oncoming headlights at night
- Noticeably reduced contrast in rain or low light
- Eye strain and fatigue on evening drives
- A persistent haze that won't clean off
Glare-related visibility loss is a genuine safety issue, not just an annoyance — it slows your reaction to hazards at night. If your night driving has become stressful, it's worth getting the glass evaluated. Check windshield replacement pricing and we'll tell you honestly whether your pitting warrants replacement.
FAQ
Can a pitted windshield be polished instead of replaced?
Usually not safely. Polishing risks optical distortion in your direct line of sight, and it can't address thousands of pits across the whole surface. Replacement is the reliable fix for severe pitting.
Why is the glare only bad at night?
By day, ambient light washes out the scatter. At night, a bright headlight against a pitted surface blooms into starbursts because each tiny pit refracts that point of light.
Will new wiper blades fix the glare?
No. Worn wipers cause smearing that adds haze, so new blades help with film, but they can't fix pitting that's already etched into the glass.
Does insurance cover a pitted windshield replacement?
Pitting is gradual wear rather than a single damage event, so coverage varies. Sudden damage like a rock chip is more typically covered. Check with your insurer about your comprehensive policy.
How long does it take to get this bad?
It varies, but several Calgary winters of highway driving with road grit can produce noticeable pitting. High-mileage and long-commute vehicles show it sooner.
See clearly again at night
Windshield pitting builds up so gradually that many drivers don't realize how much night vision they've lost until they sit behind fresh glass. If oncoming headlights blind you and rainy nights feel dangerous, pitting is likely the cause — and replacement is the dependable cure. ForbiddenGlass assesses whether your glare is pitting or just grime, and fits a clear new windshield when it's warranted. Book your windshield replacement with ForbiddenGlass today and take the strain out of night driving in Calgary.