CO CDL Tanker Vehicles Marathon
Original questions by our team Based on 2026 CO CDL Handbook
Ready for something a little different? This Colorado CDL Tanker Vehicles Marathon is a new study tool that contains a compilation of all 96 questions that we have available for this CO endorsement. If you make a mistake, we’ll remember that question and will display it to you again at the very end of the Marathon until you’ve answered that question correctly. In other words, the Marathon will cycle through your missed questions until you answer each one correctly. You must make a 100% to pass. We suggest you attempt this one after you have practiced the state’s “regular” tests, but before the “Exam”. Good luck!