Quick Answer: Under 49 CFR 393.60(c), a commercial truck windshield must be free of damage above the top of the steering wheel, excluding a 2-inch top border and 1-inch side borders. Two exceptions pass: a single crack no other crack intersects, and damage a 3/4-inch disc can cover that sits at least 3 inches from other damage.
Fleet managers along the Houston Ship Channel know the pattern. A drayage tractor runs Barbours Cut all week, catches a rock on SH 225, and by Friday the driver is asking whether that star break will get the truck written up. Federal rules answer that question with actual measurements, which makes windshield compliance one of the few inspection items you can check with a ruler and a penny in your own yard.
Why This Matters
- Violations follow the carrier, not just the driver. Roadside inspection results feed FMCSA’s Safety Measurement System, and vehicle maintenance violations count against your carrier’s profile. Brokers and shippers look at those scores.
- Texas still inspects commercial vehicles every year. The 2025 end of passenger car safety inspections did not apply to commercial vehicles in any county.
- There is no “fix it and it goes away” option for trucks. Texas courts can dismiss many equipment tickets if the owner corrects the defect before court, but that provision specifically excludes commercial motor vehicles.
- Visibility is a real crash factor. A driver heading east on I-10 toward Baytown at sunrise looks straight into low sun. Cracks light up and wash out the road ahead.
The Federal Windshield Standard, Broken Down
The rule lives in the Federal Motor Carrier Safety Regulations at 49 CFR 393.60. Here is how it translates to a real tractor or straight truck.
The regulated viewing area
- It starts at the height of the top of the steering wheel and extends upward.
- It excludes a 2-inch border along the top edge of the windshield.
- It excludes a 1-inch border at each side of the windshield or each panel of a two-piece windshield.
On most trucks, that zone lines up closely with the glass the wipers sweep, which is why drivers often describe the rule in terms of the wiper area. The regulation itself uses the steering wheel and border measurements.
Damage that is allowed inside that area
- A single crack that no other crack intersects. Length is not the trigger in the current rule. Intersection is.
- A damaged area that a 3/4-inch disc can cover, as long as it is at least 3 inches from any other similar damage. A U.S. penny is 3/4 inch across, so it makes a handy yard gauge.
- Factory coloring or tinting that meets the rule’s light transmission standard.
Damage that is a violation inside that area
- Two or more cracks that cross or touch each other
- A chip, bullseye, or star break larger than a penny
- Two penny-sized chips closer than 3 inches apart
- Discoloration, including milky delamination creeping in from the edges
- Star breaks whose legs have grown past the penny and now function as intersecting cracks
Two requirements fleets often overlook
- Marking: Glazing must meet Federal Motor Vehicle Safety Standard 205 and carry the required markings. Unmarked or improperly marked replacement glass is a problem on its own.
- Mounting: Each windshield, or each panel of a multi-piece windshield, must be mounted using its full perimeter. Glass that is loose or partly unbonded does not comply even if it has no cracks.
What You Can Mount on a Commercial Windshield
Section 393.60(e) controls what goes on the glass, and it matters every time a windshield is replaced and equipment gets reinstalled.
- Antennas, transponders, and similar devices must sit no more than 6 inches below the upper edge of the windshield and outside the area the wipers sweep.
- Vehicle safety technology, such as collision warning units, may be mounted within 8.5 inches below the top of the wiper-swept area or within 7 inches above its bottom, and must stay outside the driver’s sight lines to the road and signals.
- Required decals and inspection stickers may go at the bottom or sides, no more than 4.5 inches up from the bottom, and outside the wiper sweep.
Repair or Replace: Making the Call for Fleet Trucks
Repair when: the damage is a fresh chip or bullseye still smaller than a penny, it is not crowding another chip, and it is not sitting directly in the driver’s primary line of sight. A professional chip and crack repair stops the spread and can keep a truck compliant for years. Repairs are not always invisible, so very central damage may still be better handled with new glass.
Replace when: cracks intersect, a star break has outgrown the penny, two chips have landed too close together, delamination has reached the viewing area, or a crack starts at the edge. A proper commercial windshield replacement with correctly marked glass closes the issue before the next roadside stop.
Do not wait when: the truck is due for its annual Texas inspection, heading into a known enforcement corridor, or the damage is growing day to day.
Common Mistakes Fleets Make With Windshield Damage
- Replacing glass that would pass. A single long crack with nothing crossing it can be compliant. Pulling a truck out of service for unnecessary replacement costs revenue and a work day.
- Ignoring the single crack that will fail next week. The moment a second rock strike sends a new crack into the old one, that truck is in violation. Long cracks are on borrowed time on port and plant routes.
- Measuring size but not spacing. Two small chips 2 inches apart can fail even though each passes the penny test on its own.
- Reinstalling devices wherever they fit. After a replacement, transponders and fleet cameras sometimes get stuck back in the wiper sweep, creating a new violation on brand-new glass.
- Buying the cheapest glass without checking markings. Improperly marked glazing can be written up, and questionable glass rarely fits a gasket or bond line correctly.
- Leaving wipers out of the glass conversation. Damaged glass chews up wiper blades. An inoperative or ineffective driver-side wiper during weather that requires wipers is an out-of-service condition under the current CVSA criteria.
In-House Fix vs Professional Auto Glass Installer
Shop mechanic or driver handles it
- Resin kits bought in bulk may seem cheap per truck, but a cloudy or bubbled fill in the viewing area can still be written up as damage.
- Older gasket-set windshields look simple to swap, yet a poorly seated lock strip leaks and lets the glass shift.
- Bonded windshields require the right urethane, primers, and setting technique, which most general maintenance shops do not stock.
- Work orders often lack glass part numbers, which leaves gaps in maintenance records.
Professional installer
- Identifies whether damage is compliant, repairable, or a replacement before you pay for anything.
- Sources correctly marked glass for your specific make, model, and cab configuration.
- Reinstalls transponders, cameras, and decals in compliant positions.
- Provides dated invoices that fit neatly into your maintenance file.
- Can come to your yard so the truck keeps its schedule.
A Simple Windshield Check for Fleet Yards
- Keep a penny and a tape measure in the dispatch office.
- During post-trip walkarounds, have drivers check the glass while they check the wipers, and note any new strike.
- Test every chip with the penny and measure the distance to the nearest other damage.
- Photograph damage with a date stamp and log it by unit number.
- Schedule repair within a day or two for anything close to a limit, before heat and vibration spread it.
- File the glass invoice with the unit’s maintenance records.
Fleets that also run loaders, forklifts, and yard equipment can bundle that work with road trucks. Our team covers heavy equipment glass repair and replacement, and our guide on glass for tractors, forklifts, and excavators covers the off-road side of the fleet.
Why Choose Joey’s Glass
- Experience: Since 1973, Joey’s Glass has worked on the vehicles that keep Baytown’s industrial economy moving, from service pickups to tractors and heavy equipment. Learn more about our family-owned company.
- Reliability: Fleet schedules do not wait. We give clear compliance-focused recommendations and book work around your dispatch windows, Monday through Friday.
- Quality and Technology: We install properly marked glass, use the correct bonding or gasket methods for each cab, and put mounted equipment back in compliant positions.
- Service Area and Coverage: From our shop at 3011 N. Main, we serve fleet yards across Baytown, the Ship Channel corridor, East Houston, EaDo, and Chambers County. Check our service area for locations.
Call 281-427-4705, contact our fleet team, or request a fleet glass quote to get damaged units compliant before their next inspection.
Frequently Asked Questions
Does windshield damage on the passenger side count during a DOT inspection?
Yes. The regulated area runs across the windshield from side to side, stopping only at the 1-inch side borders. Many drivers assume only the glass in front of the steering wheel matters, but damage in front of the passenger seat above steering wheel height is measured the same way.
Will a cracked windshield put my truck out of service at roadside?
A windshield glass violation is usually documented on the inspection report rather than stopping the truck on the spot, but it still counts against the carrier’s safety data. Wiper failure in bad weather is the glass-area issue most likely to ground a truck immediately.
Do these federal windshield rules apply to a business pickup?
They can. Interstate commercial motor vehicle rules generally begin at a gross vehicle or combination weight rating of 10,001 pounds. Texas applies similar standards to many intrastate carriers with some different thresholds, so confirm your status with Texas DPS commercial vehicle enforcement.
Is window tint on a truck windshield a violation?
Tint on the windshield and the windows immediately left and right of the driver must still let through at least 70 percent of light. Aftermarket film that drops below that level can be written up even when the glass itself is undamaged.
How fast can a damaged truck windshield be fixed?
A chip repair often takes under an hour and the truck can return to service right away. Replacement time depends on glass availability and whether the windshield is bonded or gasket-set, and bonded glass needs adhesive cure time before the truck rolls.