Establishing that certain provisions governing signage at retail service stations supersede inconsistent local law; altering a signage requirement for retail service stations relating to the price of regular gasoline so that the signage prominently displays clearly and visibly the credit and debit price, if higher than the cash price, or the credit and debit price and the cash price; repealing an exemption from a certain signage requirement for retail service station dealers with not more than 3 dispensing units; etc.