Studying the District of Columbia CDL manual is one of the most effective ways to get you ready to pass your commercial driver’s license, permit, or renewal test. On this page, we provide you with the latest version of the DC CDL Manual. This CDL manual covers various topics, including CDL general knowledge and requirements, combination vehicles, air brakes, tank vehicles, hazmat, double triples, passenger vehicles, school bus, vehicle inspections, and road skills tests. They are everything you need to study to pass your DC CDL test or get the endorsement needed. So, you should read the DC CDL handbook thoroughly, and take the free District of Columbia CDL practice test on our websites. Once you feel confident with those as well, head over to your local DMV, take the District of Columbia CDL exam, pass it, and start your rewarding career as a commercial driver in DC!