King of the Highway: The Ultimate Big Rig & Semi-Truck Operations Challenge

What does flipping the inter-axle differential lock switch on the dashboard do?

45%

Correct!

Incorrect!

Semi-tractors have tandem drive axles. Engaging the inter-axle lock (power divider) forces both axles to drive at identical speeds, preventing one axle from spinning uselessly on ice or mud, maximizing traction.

What does flipping the inter-axle differential lock switch on the dashboard do?

Disconnect the transmission from the engine

Apply maximum emergency air brake pressure

Forces both rear drive axles to turn together

Slides the trailer tandems automatically

45%