Windshield chips, cracks and window tint do not automatically cause a commercial vehicle to fail an annual DOT inspection. The result depends on the type, size and location of the damage, whether cracks intersect, and how much light passes through the glass.
The short version
- Windshield chips: In the federally inspected area, a damaged spot is allowed only when it is no more than 3/4 inch in diameter and at least 3 inches from another similar damaged area.
- Windshield cracks: Under the annual inspection standard, an allowed crack must be no more than 1/4 inch wide and must not intersect another crack. The rule does not state a maximum crack length, but spreading, branching or intersecting cracks can change the result.
- Windshield and front side-window tint: Federal rules generally require at least 70% light transmission. That means at least 70% of the light must pass through the glass—not that a “70% dark” tint is allowed.
- Do not wait: A repairable chip can collect dirt, spread into a crack or become unsuitable for repair. It is usually better to address it before the inspection appointment.
Will windshield damage pass an annual DOT inspection?
The federal minimum periodic inspection standards are found in Appendix A to 49 CFR Part 396. For windshield glazing, the standard focuses on the area above the topmost portion of the steering wheel, excluding a 2-inch border across the top and a 1-inch border along each side.
This is the federal inspection area described by the regulation. It is not simply the area swept by the driver-side windshield wiper.
Chips and other small damaged areas
Within the federally inspected area, a chip or other damaged spot is an exception to the rejection standard only when:
- The entire damaged area is no more than 3/4 inch in diameter; and
- It is at least 3 inches from any other similar damaged area.
The federal standard does not create a simple “three-chip limit.” The number of chips is not the deciding factor; their size, spacing and location are.
Cracks
For an annual periodic inspection, Appendix A allows a crack in the inspected area only when it is no more than 1/4 inch wide and is not intersected by another crack. The federal text does not assign a maximum length to that exception.
That does not make every long crack acceptable. A crack that branches, intersects another crack, reduces vision or develops additional damage may fail the standard. Windshield condition can also be evaluated during a roadside inspection under 49 CFR §393.60.
Mobile windshield chip repair
Truck Inspectors now offers mobile windshield chip repair in South Florida. When the damage is suitable for repair, we may be able to repair it at your location, including during an annual inspection appointment.
Repairability depends on the type, size, depth, location and condition of the damage. Dirt or moisture in the break, prior spreading and damage near an edge can affect the result. A professional repair is intended to stabilize the damaged area and improve its appearance, but the repaired spot may remain visible and no glass repair can guarantee that a windshield will never crack or spread later.
Send us a clear photo of the damage for an initial review. We can confirm current availability and discuss whether repair should be scheduled before or with your inspection.
What are the federal tint rules for commercial vehicles?
49 CFR §393.60(d) allows coloring or tinting on a commercial vehicle’s windshield and the windows immediately to the driver’s left and right, provided the glazing meets the federal light-transmission requirement. The parallel luminous transmittance through the colored or tinted glazing must be at least 70% in portions of the glass marked as having at least 70% light transmission.
Important: “70% light transmission” means the finished glass-and-film combination must allow at least 70% of normal light through. Factory glass may already reduce some light, so a film labeled “70% VLT” does not necessarily produce a compliant final reading after installation.
FMCSA’s published guidance also answers the tint question directly: windshields and side windows may be tinted as long as light transmission is not reduced below 70%.
The specific federal 70% restriction in §393.60(d) does not apply to the commercial vehicle’s other windows. However, that does not make every rear-window treatment legal everywhere. State requirements and other visibility or equipment rules may still apply.
A note about aftermarket windshield tint
The federal operating rule permits qualifying tint, while the annual inspection standard separately lists coloring or tinting applied at the time of manufacture as an exception to its windshield-glazing rejection criteria. Because the wording is not identical, do not assume that aftermarket windshield film will pass solely because of the shade printed on the box. The installed glass should be evaluated for its actual light transmission and its compliance with all applicable rules.
Before your inspection appointment
- Clean the inside and outside of the windshield so the damage can be evaluated accurately.
- Check for branching or intersecting cracks, not just the original impact point.
- Measure the distance between nearby chips or damaged areas.
- Do not cover damage with stickers, decals or accessories.
- If the glass is tinted, have the finished glass tested with an appropriate light-transmission meter.
- Send us photos before the appointment if you are unsure whether a chip may be repairable.
Sources
- Appendix A to 49 CFR Part 396—Minimum Periodic Inspection Standards
- 49 CFR §393.60—Glazing in Specified Openings
- FMCSA Guidance: May Windshields and Side Windows Be Tinted?
Last reviewed September 3, 2026. This article provides general information about federal commercial-vehicle requirements. The actual inspection result depends on the vehicle’s condition at the time of inspection and any other applicable federal, state or local requirements.