(a) Any conflict between a provision of this chapter and any federal law or implementing regulation, such provision of this chapter shall be void and of no force and effect and unenforceable. Any such provision of this chapter declared to be inoperable, as provided herein, shall be brought to the attention of the next session of the General Assembly and shall not, in any event, serve to invalidate any other provision of this chapter.
(b) Any other provision of this chapter to the contrary notwithstanding, a vehicle or combination of vehicles having a weight in excess of that permitted by § 4503 of this title lawfully may be operated on any interstate highway or United States numbered route if such vehicle or combination of vehicles has been issued a permit for that purpose pursuant to § 4504 of this title. Regarding such permits issued pursuant to § 4504(c)(1) of this title, the State has determined that vehicles bearing such permits could be lawfully operated within this State on July 1, 1956.