§393.60 requires glazing in specified vehicle openings to be of a type that meets ANSI Z26.1 ("AS-1" or "AS-2" markings for windshields; AS-3 in some side applications) and to remain free from discoloration, cracks, or damage in the driver's field of view. The rule is enforced primarily through §393.60(c)–(e): no obstructions in the windshield's swept area, no cracks longer than the §393.60(e) thresholds, and no discoloration affecting visibility.
Severity weight
Severity weight 1 in the Vehicle Maintenance BASIC. The weight is low in isolation but a §393.60 finding combined with §393.78 wipers and §393.79 defrosters produces a cluster that auditors treat as a visibility-program failure.
Specific limits
- A crack longer than ¼ inch in the windshield is a finding when it crosses the driver's swept area.
- Stone-strike damage where the largest dimension exceeds ¾ inch in the swept area is a finding.
- Aftermarket tint on the windshield (above the AS-1 line) is a finding regardless of light transmittance.
How to prevent it
- Replace windshields promptly when cracks begin to spread. The temperature-cycle of an over-the-road truck spreads cracks fast.
- Avoid suction-cup or adhesive accessories in the swept area — they are §393.60(d) obstructions in their own right.
- Verify aftermarket glass carries an ANSI Z26.1 marking before installation.
How Roadworthy HQ helps
A glazing citation shows up in Roadworthy HQ as part of the inspection it came from, not as a record of its own: the app does not store individual violation codes. Log the roadside inspection on the vehicle's Inspections tab: date, state, level, driver, the number of violations, and whether it was out-of-service. For an out-of-service inspection the 15-day §396.9(d)(3) repair-certification countdown stays on that tab until you enter the certification date. The rule's 15 days cover every violation on the report, not only out-of-service ones, so for a non-OOS inspection that date is yours to track. The repair itself goes in the vehicle's maintenance log: date, type, what was done, who did it, and cost. DVIRs are logged per vehicle with the defect described in your own words, and a defect marked safety-affecting that is logged without a repair certification sends a critical alert.