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For safety purposes, when should you turn off a retarder?

A When the roadways are slippery
Retarders are mechanisms in some vehicles that help slow a vehicle and reduce the need for braking. However, using a retarder may cause wheels to skid when they have poor traction. Turn off retarders when traveling under wet, snowy, or icy conditions. more
B When you are carrying a passenger
C When you are carrying a heavy load
D When driving in heavy traffic