21 Del. C. § 302

(a) The Secretary of Transportation and/or the Secretary of Safety and Homeland Security, in keeping with their respective responsibilities, may adopt and enforce such administrative rules and regulations and designate such agencies as may be necessary to carry out this title. The Secretary of Transportation and/or the Secretary of Safety and Homeland Security, in keeping with their respective responsibilities, may also adopt and enforce such rules and regulations relative to equipment, weight, size and operation of motor vehicles, provided such rules and regulations are not contrary to a positive law, as may be necessary and proper in order to conform to the rules and regulations of the Interstate Commerce Commission and in order to establish a more uniform Motor Vehicle Code and more uniform traffic rules and regulations. No rule or regulation adopted pursuant to the authority granted by this section shall extend, modify or conflict with any law of this State, or the reasonable implications thereof.

(b) Any rules, regulations, procedures or agreements enacted, authorized or entered by the Secretary of Public Safety prior to July 1, 2003, shall remain in effect until such time as these rules, regulations, procedures or agreements are replaced, terminated or amended by the appropriate departmental Secretary.