Ace Your DMV Written Test with our Guaranteed Cheat Sheet.

Cheat sheet
Poisonous fumes can enter the cab due to:
A.  A defective exhaust system.
B.  The wrong type of fuel being used.
C.  A lack of oil in the engine.
D.  Under-inflated tires.
Defects in an exhaust system are very dangerous because they can cause poisonous fumes to enter the cab or sleeper berth.
Answer Statistics
3 % of our users get this question wrong.
This questions is relatively Easy

Pass your DMV Written Test with flying colors

Ace Your DMV Written Test
Get your Cheat Sheet Now!