How many questions can you miss on the CDL Montana?

You must correctly answer at least

40 of the 50 questions on the Montana Commercial Drivers License

("CDL") General Knowledge test. If you drive certain kinds of

commercial trucks or buses, you must take certain additional test -

Air Brakes (25 questions), Hazardous Material (30 questions), Tank

(20 questions), Passenger (20 questions), Doubles/Triples (20

questions), Combination Vehicles (20 questions), or School Bus (20

questions). Each of these special areas require that you correctly

answer at least 80% of the questions in an individual test

area.