DOT Passenger Carrier & Motorcoach Safety Inspections — Questions and Answers
Question 1: Under 49 CFR Part 393, a motorcoach must have emergency exits that can be opened from both inside and outside the vehicle. What is the minimum clear opening width required for a rear emergency door on a bus?
- 18 inches
- 24 inches (Correct answer)
- 28 inches
- 36 inches
Correct answer: 24 inches
49 CFR 393.62 requires that rear emergency doors on buses provide a minimum clear opening of 24 inches in width and 48 inches in height so that passengers can evacuate quickly. An inspector must verify that the door opens freely and meets the dimensional requirement.
Question 2: During a passenger carrier inspection, an inspector finds that the push-out emergency window on a motorcoach requires more than the regulatory maximum force to open. What is the maximum allowable force to release a push-out emergency window?
- 20 pounds
- 40 pounds (Correct answer)
- 60 pounds
- 80 pounds
Correct answer: 40 pounds
49 CFR 393.62 specifies that emergency exits that push outward must be openable with no more than 40 pounds of force applied at the latch. Exceeding this threshold means passengers may be unable to evacuate in an emergency, making it an out-of-service condition.
Question 3: Which of the following is a unique out-of-service condition applicable to passenger-carrying vehicles but NOT to standard freight vehicles?
- Defective air brakes with less than 20% adjustment stroke remaining
- A fuel system leak at a fitting
- An emergency exit that is locked or cannot be unlatched from the inside (Correct answer)
- A steering wheel with more than 10 degrees of play
Correct answer: An emergency exit that is locked or cannot be unlatched from the inside
Emergency exit operability is an OOS criterion specific to passenger carriers. 49 CFR 393.62 requires that emergency exits open freely from both inside and outside. A locked or jammed emergency exit directly endangers passenger lives in a way that has no freight-vehicle equivalent.
Question 4: Under FMCSA regulations, a motorcoach operating in interstate commerce must be equipped with seat belts for each seating position. What is the minimum seat belt type required for motorcoach passengers under 49 CFR Part 571?
- Lap-only belts are not required in motorcoaches — only the driver requires a belt
- Type I lap-only seat belts at every seating position
- Type II lap-and-shoulder belts at every seating position (Correct answer)
- Seat belts are only required for seats forward of the rear axle
Correct answer: Type II lap-and-shoulder belts at every seating position
FMCSA rules implementing FMVSS 208 require motorcoaches manufactured after November 2016 to be equipped with Type II (lap-and-shoulder) seat belts at all seating positions, including passenger seats. Inspectors verify compliance for newer motorcoaches as part of passenger carrier inspection.
Question 5: A charter bus has a cracked windshield where the crack intersects the driver's direct line of sight in the area swept by the wiper blade. How should the inspector handle this finding?
- Issue a warning and require repair within 15 days — windshield cracks are not immediate OOS criteria for buses
- Place the vehicle out of service immediately — windshield cracks in the driver's vision zone are an OOS condition (Correct answer)
- Allow operation only in daylight hours until repaired
- Note the defect in the inspection report but take no enforcement action unless the crack exceeds 12 inches
Correct answer: Place the vehicle out of service immediately — windshield cracks in the driver's vision zone are an OOS condition
Under the CVSA OOS criteria for all CMVs, a crack, discoloration, or vision-obstructing matter in the driver's critical viewing area (the area swept by the wiper blade that is in the driver's line of sight) is an immediate OOS condition. This applies equally to passenger carriers.
Question 6: When inspecting a motorcoach, which item is on the passenger carrier inspection checklist that would NOT typically appear on a standard freight truck inspection checklist?
- Condition of tires and wheels
- Proper operation of the fire suppression system in the engine compartment (Correct answer)
- Functionality of the air brake system
- Compliance with size and weight limits
Correct answer: Proper operation of the fire suppression system in the engine compartment
FMCSA requires motorcoaches manufactured after October 2016 to be equipped with automatic fire suppression systems in the engine compartment. Inspectors check that the system has not been disabled or tampered with. This requirement is specific to motorcoaches and does not apply to freight vehicles.
DOT Passenger Carrier & Motorcoach Safety Inspections
Under 49 CFR Part 393, a motorcoach must have emergency exits that can be opened from both inside and outside the vehicle.
What is the minimum clear opening width required for a rear emergency door on a bus?