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CDL Practice Test
General Knowledge
Air Brakes
Combination Vehicles
Doubles and Triples
Tanker Vehicles
Hazardous Materials
Transporting Passengers
CDL General Knowledge Practice Test
Question 1 of 3
When should you consider turning off a vehicle retarder system?
A
During wet or icy road conditions
B
When driving on steep grades
C
When crossing standing water
D
During windy conditions
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