When driving with emergency roof hatches partly open, which changed dimension must the bus driver consider?
Correct answer: A – The bus’s increased overhead clearance
A partly open emergency roof hatch increases the bus’s effective height. The driver must keep the higher clearance in mind when approaching overhead obstructions. Roof hatches may be locked partly open for fresh air when permitted, but the manual advises against leaving them open as a regular practice.
Source: New York State Commercial Driver’s Manual CDL-10 — § 4.2.4, “Roof Hatches”

