"Although we handle minor collision work in-house, when it comes to paint, 312 Truck is our go-to. Their pricing is among the most competitive in the Chicagoland area—often half of what others charge while still delivering high-quality results. They’ve been a valuable extension of our team."
DOT Regulations for Truck Glass: Are You Compliant? What You Should Know…

Team #312Truck
Cracks, chips, and improper tinting can all fail a DOT inspection. Here's what fleet managers need to know about truck glass compliance—and how to stay inspection-ready.
Whether you’re running a single commercial truck or an entire fleet, DOT compliance isn’t optional—it’s the foundation of legal operation. And while most managers focus on emissions, brakes, and lighting, there’s one area that often slips through the cracks: windshield and window glass.
At 312 Truck Body Repair & Painting, we help fleet owners stay road-legal by offering compliance-first truck glass repair and replacement. Below, we break down the key DOT regulations, the most common disqualifying issues, and how to make sure your trucks pass inspection the first time.
What Are the DOT Regulations for Truck Glass?
According to the Federal Motor Carrier Safety Regulations (FMCSR):
- Windshields must be free from discoloration or obstructions.
- Cracks in critical viewing areas are disqualifying.
- Tint must meet specific visibility thresholds.
- Windows on either side of the driver must allow 70% or more light transmittance.
Key visibility areas (aka “critical zones”) are especially scrutinized during inspections. A small chip in the wrong spot can put a vehicle out of service.
What Disqualifies a Truck for Inspection?
DOT inspectors look for:
- Cracks over ¾ inch in diameter within the driver’s field of vision
- Spiderwebbing or star breaks that obscure sightlines
- Improper tinting or aftermarket films
- Missing or loose rubber molding around the windshield
- Scratches, cloudiness, or discoloration that impair visibility
Even a worn-out wiper blade that can’t clear rain properly may cause a violation during an inspection.
How Non-Compliance Impacts Your Fleet
DOT violations don’t just result in hefty fines—they can take trucks out of service, stall deliveries, and reduce your CSA scores. For fleet managers, even a few non-compliant vehicles can damage your company’s safety rating and reputation.
Truck Glass Inspection Checklist
Use this checklist before your next scheduled inspection:
✅ No cracks larger than ¾ inch in viewing area
✅ No chips in the sweep area of the wipers
✅ All windows allow 70%+ light through
✅ Windshield is securely mounted with no gaps in the seal
✅ Wiper blades are in good condition
✅ No hazing, scratches, or interior fogging
✅ No stickers or decals obstructing view
Bonus: Keep a log of regular glass inspections to document your fleet’s compliance history.
Truck Glass Services at 312 Truck Body Repair
Our team doesn’t just swap glass—we ensure every replacement meets DOT and FMCSR standards, including:
- Windshield replacement for commercial trucks
- Side and rear window installation
- Fleet-wide glass inspection programs
- OEM-quality seals and fitments
- Post-installation compliance checks
We also offer fast turnaround times to reduce downtime and keep your fleet running efficiently.
Stay Compliant. Stay on the Road.
DOT regulations might seem like a hassle, but with the right truck glass service partner, staying compliant is simple. Don’t risk delays, citations, or downtime.Get a quote from 312 Truck Body Repair today—and make glass compliance one less thing to worry about.