The numerals on all number plates shall be no less than three inches in height and the strokes thereof no less than three-eighths inch in width, except in the case of motorcycles, in which case the numerals shall be no less than one inch in height and the strokes thereof no less than one-eighth inch in width.
The director of finance of the city and county of Honolulu shall contract annually on behalf of the counties for the purchase of all number plates, tags, or emblems required. The council of each county shall appropriate and cause to be paid over to the party with whom the director of finance of the city and county of Honolulu shall contract, or to the director of finance of the city and county of Honolulu as the director may direct, the sum or sums as the director of finance of the city and county of Honolulu shall determine to be the county's proportionate share of the expense of the contract and the charges connected therewith. The contract shall be made by the director of finance of the city and county of Honolulu as agent of the several counties, and the proportionate liability of each county shall be stated in the contract. Notwithstanding any other provision of the law, the contract shall constitute a valid obligation of each county for its proportionate share.
HRS § 249-9
Attorney General Opinions
All motor vehicle number plates must be uniform in all respects including the reflective material. Att. Gen. Op. 67-17.