You can obtain endorsements for your commercial driver’s license. At a minimum, Roehl Transport requires you get the air brakes and combination vehicle endorsements. If you plan on obtaining endorsements, you’ll want to go ahead with the relevant exam when you take the written and skills exams. This will save you the time and trouble of returning to the DMV and getting back into test-taking mode, however many drivers get their Hazardous Materials Endorsements after they get their CDLs. Having a haz-mat endorsement means you can haul more diverse freight, and that makes you more valuable to many trucking companies.