Drivers required to be licensed.

(a) General rule.--No person, except those expressly exempted, shall drive any motor vehicle upon a highway or public property in this Commonwealth unless the person has a driver's license valid under the provisions of this chapter. As used in this subsection, the term "public property" includes, but is not limited to, driveways and parking lots owned or leased by the Commonwealth, a political subdivision or an agency or instrumentality of either.

(b) Persons in towed vehicles.--No person, except those expressly exempted, shall steer or, while within the passenger compartment of the vehicle, exercise any degree of physical control of a vehicle being towed by a motor vehicle upon a highway in this Commonwealth unless the person has a valid driver's license under the provisions of this chapter for the type or class of vehicle being towed.

(c) Limitation on number of licenses.--No person shall receive a driver's license unless and until the person surrenders to the department all valid licenses in the person's possession issued by this or any other state. The department shall either return surrendered licenses issued by another state to that state or submit a list of the surrendered licenses to the state, together with information that the person is licensed in this Commonwealth. No person shall be permitted to have more than one valid driver's license issued by this or any other state at any time. A nonresident who holds a nonresident commercial driver's license issued by the Commonwealth under