Section 393.70(d) requires that every full trailer must be coupled to the frame

Section § 393.70: Coupling devices and towing methods, except for driveaway-towaway operations.

Question 3: Section 393.70(d) requires that every full trailer must be coupled to the frame, or an extension of the frame, of the motor vehicle which tows it with one or...

When two safety chains are used, must the ultimate combined breaking strength of each chain be equal to the gross weight of the towed vehicle(s) or would the requirements be met if the combined breaking strength of the two chains is equal to the gross wei

Section § 393.70: Coupling devices and towing methods, except for driveaway-towaway operations.

Question 2: When two safety chains are used, must the ultimate combined breaking strength of each chain be equal to the gross weight of the towed vehicle(s) or would the...

Is there a minimum number of fasteners required to fasten the upper fifth wheel plate to the frame of a trailer?

Section § 393.70: Coupling devices and towing methods, except for driveaway-towaway operations.

Question 1: Is there a minimum number of fasteners required to fasten the upper fifth wheel plate to the frame of a trailer?

Guidance: The FMCSRs do not...

What standards under the FMCSRs must be met when a liquid fuel tank is repaired or replaced?

Section § 393.67: Liquid fuel tanks.

Question 3: What standards under the FMCSRs must be met when a liquid fuel tank is repaired or replaced?

Guidance: A replacement/repaired tank must meet the applicable standards in § 393.67.

Do the FMCSRs specify a particular pressure relief system?

Section § 393.67: Liquid fuel tanks.

Question 2: Do the FMCSRs specify a particular pressure relief system?

Guidance: No, but the performance standards of § 393.67(d) must be met.

May a properly vented fuel cap be used on a fuel tank equipped with another fuel venting system?

Section § 393.67: Liquid fuel tanks.

Question 1: May a properly vented fuel cap be used on a fuel tank equipped with another fuel venting system?

Guidance: Yes (see § 393.3).

Must a motor vehicle that meets the definition of a "commercial motor vehicle" in § 390.5 because it transports hazardous materials in a quantity requiring placarding under the Hazardous Materials Regulations (49 CFR parts 171-180) comply with the fuel

Section § 393.65: All fuel systems.

Question 2: Must a motor vehicle that meets the definition of a ‘‘commercial motor vehicle’’ in § 390.5 because it transports hazardous materials in a quantity requiring placarding under the Hazardous Materials Regulations (49...

May a fuel fill pipe opening be placed above the passenger floor level if it is not physically within the passenger compartment?

Section § 393.65: All fuel systems.

Question 1: May a fuel fill pipe opening be placed above the passenger floor level if it is not physically within the passenger compartment?

Guidance: Yes. In addition, the fill pipe may intrude into the passenger...

Which edition of FMVSS No. 217 is required to be used in determining the emergency exit space requirements when retrofitting buses?

Section § 393.62: Emergency exits for buses.

Question 4: Which edition of FMVSS No. 217 is required to be used in determining the emergency exit space requirements when retrofitting buses?

Guidance: The cross reference to FMVSS No. 217 applies to the...

Do school buses which meet the school bus emergency exit requirements established by NHTSA’s November 2, 1992, final rule on FMVSS No. 217 have to be retrofitted with additional emergency exits when used in interstate commerce for non-school bus operation

Section § 393.62: Emergency exits for buses.

Question 3: Do school buses which meet the school bus emergency exit requirements established by NHTSA’s November 2, 1992, final rule on FMVSS No. 217 have to be retrofitted with additional emergency exits when used in...