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CDL Practice Test
General Knowledge
Air Brakes
Combination Vehicles
Doubles and Triples
Tanker Vehicles
Hazardous Materials
Transporting Passengers
CDL Transporting Passengers Practice Test
Question 1 of 3
Emergency roof hatches:
A
Can be locked fully open for fresh air
B
Must be kept closed and locked at all times
C
Can be left open as a regular practice
D
Can be locked partially open for fresh air
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