Del. Code tit. 21 § 2171
No person shall drive or move, nor shall any person, being the owner of a taxicab or limousine, knowingly permit to be driven or moved upon any highway, any taxicab or limousine which is not registered as a taxicab or limousine and for which a certificate of title has not been issued or applied for, or for which current taxicab or limousine registration plates have not been issued, as provided in this title, or for which the appropriate fees have not been paid when and as required by this chapter, except that when application accompanied by the proper fee has been made for taxicab or limousine registration and certificate of title for a vehicle, it may be operated temporarily pending complete registration upon displaying a duplicate application duly verified or other evidence of such application, or otherwise under rules and regulations promulgated by the Department.
21 Del. C. § 2171