Anyone operating a motor vehicle, motorcycle, or moped on Colorado's public streets and highways must be at least 16 years old and have a valid driver's license or learner's permit. Applicants must pass all relevant exams (physical, vision, written, and/or driving) as well as pay the required fees. The questions on the Colorado DMV knowledge test will include the contents of the Colorado Driver Manual, such as road signs, driving rules, safety rules, and legal issues. There are 25 questions on the CO DMV written test. You must correctly answer at least 20 questions (80%) to pass. Let's start with our Colorado practice permit tests now.