- § 393.11
Lamps and reflective devices.
- § 393.17
Lamps and reflectors—combinations in driveaway-towaway operation.
- § 393.24
Requirements for head lamps, auxiliary driving lamps and front fog lamps.
- § 393.25
Requirements for lamps other than head lamps.
- § 393.28
- § 393.40
Required brake systems.
- § 393.41
Parking brake system.
- § 393.42
Brakes required on all wheels.
- § 393.43
Breakaway and emergency braking.
- § 393.44
Front brake lines, protection.
- § 393.48
Brakes to be operative.
- § 393.51
Warning signals, air pressure and vacuum gauges.
- § 393.52
- § 393.60
Glazing in specified openings.
- § 393.61
Truck and truck tractor window construction.
- § 393.62
Emergency exits for buses.
- § 393.65
All fuel systems.
- § 393.67
Liquid fuel tanks.
- § 393.70
Coupling devices and towing methods, except for driveaway-towaway operations.
- § 393.71
Coupling devices and towing methods, driveaway-towaway operations.
- § 393.75
- § 393.76
- § 393.81
- § 393.82
- § 393.83
- § 393.87
Warning flags on projecting loads.
- § 393.88
- § 393.89
Buses, driveshaft protection.
- § 393.92
- § 393.93
Seats, seat belt assemblies, and seat belt assembly anchorages.
- § 393.100
Which types of commercial motor vehicles are subject to the cargo securement standards of this subpart, and what general requirements apply?
- § 393.102
What are the minimum performance criteria for cargo securement devices and systems?
- § 393.106
What are the general requirements for securing articles of cargo?
- § 393.201
Part 393Below are the available interpretations for the given section. To return to the list of parts, use the Parts link above. The menu to the left provides a full list of sections that have interpretations. To view interpretations for a different section, click on the menu item.
The regulations text of the section can be found on the eCFR website. To view the regulations text, use the link below. For assistance, please send an email to FMCSA.Webmaster@dot.gov.
View the regulations for Part 393
Guidance for § 393.60: Glazing in specified openings.
Question 1: May windshields and side windows be tinted?
Guidance: Yes, as long as the light transmission is not restricted to less than 70 percent of normal (refer to the American Standards Association publication Z26.1-1966 and Z26.1a-1969).
Question 2: May a decal designed to comply with the periodic inspection documentation requirements of §396.17 be displayed on the windshields or side windows of a Commercial Motor Vehicle CMV?
Guidance: Yes, provided the decal is being used in lieu of an inspection report and is in compliance with §393.60(c).
Question 3: If a crack extended into the thickness of the glass at such an angle as to measure 1/4" or more, measuring from the top edge of the crack on the outside surface of the windshield to vertical line drawn through the windshield to the far edge of this angled crack on the inside of the windshield, would this constitute a crack of 1/4" or more in width as defined in §393.60(b)(2)?
Guidance: No. The crack, in order to fall outside the exception, would have to be a gap of 1/4" or more on the same surface of the windshield.