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...

When calculating the minimum emergency exit space required on school buses used in non-school bus operations, should two or three passengers per bench seat be used in determining the adult seating capacity?

Section § 393.62: Emergency exits for buses.

Question 2: When calculating the minimum emergency exit space required on school buses used in non-school bus operations, should two or three passengers per bench seat be used in determining the adult seating capacity?...

May a bus being operated by a for-hire motor carrier of passengers, under contract with a governmental agency to provide transportation of prisoners in interstate commerce, be allowed to operate with security bars covering the emergency push-out windows a

Section § 393.62: Emergency exits for buses.

Question 1: May a bus being operated by a for-hire motor carrier of passengers, under contract with a governmental agency to provide transportation of prisoners in interstate commerce, be allowed to operate with security...

If a crack extended into the thickness of the glass at such an angle

Section § 393.60: Glazing in specified openings.

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...

May windshields and side windows be tinted?

Section § 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...

May the information in the stopping distance table be used to determine the stopping distances at speeds greater than 20 mph?

Section § 393.52: Brake performance.

Question 1: May the information in the stopping distance table be used to determine the stopping distances at speeds greater than 20 mph?

Guidance: No, the table is not intended to be used to predict or determine...

What difference, if any, is there between a warning device and a warning signal?

Section § 393.51: Warning signals, air pressure and vacuum gauges.

Question 5: What difference, if any, is there between a warning device and a warning signal?

Guidance: For purposes of §393.51, the terms may be used interchangeably.

Is a warning device required in a Commercial Motor Vehicle (CMV) with a single hydraulic brake system which uses the driveline parking brake as the emergency brake system?

Section § 393.51: Warning signals, air pressure and vacuum gauges.

Question 4: Is a warning device required in a Commercial Motor Vehicle (CMV) with a single hydraulic brake system which uses the driveline parking brake as the emergency brake system?

...

Are vacuum gauges required on the vacuum portion of vacuum-assisted hydraulic brakes?

Section § 393.51: Warning signals, air pressure and vacuum gauges.

Question 3: Are vacuum gauges required on the vacuum portion of vacuum-assisted hydraulic brakes?

Guidance: No. Section 393.51(d)(2) requires only that CMVs with vacuum brakes (not...

Is the vacuum portion of vacuum-assisted hydraulic brake systems required to have a warning device?

393.51: Warning signals, air pressure and vacuum gauges.

Question 2: Is the vacuum portion of vacuum-assisted hydraulic brake systems required to have a warning device?

Guidance: No. Only the hydraulic portion of vacuum-assisted hydraulic brake systems is...