Florida residents of a certain age, who pass written and operative tests, are allowed to obtain drivers' licenses that permit them to drive. However, a private drivers' license is not a free pass to operate any vehicle that contains a steering wheel. Commercial vehicles, such as big rigs, buses and tank trucks, require their drivers to hold special commercial licenses that are subject to their own testing mandates.
The requirements for possessing a commercial drivers' license are federally mandated. Such licenses can be obtained through state-run Departments of Motor Vehicles. According to the Federal Motor Carrier Safety Administration, a person interested in getting a commercial drivers' license should start by obtaining a manual on the license, and then pursuing a commercial drivers' permit. Like a private learners' permit, a permit for commercial driving only allows a commercial driver to operate a large vehicle, while under the supervision of a fully licensed commercial driver.