What must a driver keep in mind when operating a bus with an emergency roof hatch open?
Passenger (P) Endorsement • Free CDL Practice Question
Regulation
AAMVA CDL Manual Section 4.1.4, p.4-1
Why This Matters
An open roof hatch raises the effective height of the bus, which can turn a parking garage, low bridge, or overhanging tree limb that would normally clear the roofline into a collision. Drivers need to actively recalculate clearance any time a hatch is propped open.