To be a licensed driver of a big rig, an applicant must be over 21 years of age and pass a number of vision and physical exams. Most attend truck driving school to prepare for the Federal Motor Carrier Safety Regulations written exam. This is a requirement of the U.S. Department of Transportation. Then the driver gets a green card that must be renewed every two years. With the green card, he can apply to take a practical road test to get a Class A or CDL, which means Commercial Driver’s License.