California Code
ARTICLE 12 - Price Sign Advertising
Section 13536.

13536. All letters, words, figures, or numerals which are part of the advertising media referred to in this article shall have a heavy type face or stroke, shall be clearly visible, and of a color or tint that will contrast the letters, words, figures, or numerals with the background of the advertising media. The height of the letters, figures, and numerals, except the letter ā€œlā€ and numeral one, shall not be more than twice the width.

(Amended by Stats. 1985, Ch. 345, Sec. 7.)