This section supersedes any inconsistent provision of local law. A person who sells motor fuel at retail shall display signs in accordance with this section. All dispensing equipment for motor fuel shall be marked conspicuously to show in numerals of equal size the price, including taxes, of a gallon of the motor fuel offered for sale. If numerals that show a fractional cent are used, the combined height and width of the numerator and denominator shall equal the height and width of the other numerals used. A sign or other means on the premises and approaches to a retail outlet that advertises the retail price of motor fuel: may list the price and each tax separately if the listing of the total of the price and all taxes is the same size as the separate listing of the price; but shall list the total of the price and all taxes by numerals of uniform size. In the listing of the total of the price and all taxes, a denominator need not be used to indicate a fraction, but: if a denominator is used, the numerator and denominator combined shall be the same size as the numeral that indicates the whole number; or if a denominator is not used, the numerator shall be the same size as the numeral that indicates the whole number. If the retail price of motor fuel is advertised on a sign or by other means on the premises of and approaches to the retail outlet, the grade designation displayed for any motor fuel in the advertisement shall be the same as the grade designation that is required to be displayed for that motor fuel on the retail dispensing pump as specified by the Comptroller. Each retail service station dealer shall keep a sign on the premises that: prominently displays clearly and visibly, for a whole measurement unit of regular gasoline sold on the premises: the credit and debit price, if higher than the cash price; or the credit and debit price and the cash price; states the unit of measurement used; and is readable by passing motorists. The sign required under subparagraph (i) of this paragraph also may prominently display clearly and visibly, for a whole measurement unit of diesel and other motor fuel products sold on the premises: the credit and debit price, if higher than the cash price; or the credit and debit price and the cash price. All numerals on the sign shall: be uniform; be the same size; be at least 8 inches high and 3.5 inches wide; and have a brush stroke of at least 1 inch. A numeral in a fraction or a letter shall be at least one–third the height of a numeral that indicates a whole number. If a new or additional sign is required to comply with this subsection, the supplier of the gasoline shall provide the sign and numerals without cost to the retail service station dealer. A sign required at a service station by this section or any other State or federal law is exempt from the provisions of a local law, ordinance, or regulation for the purpose of determining: the total number of signs permitted; and the area of signs permitted.