(a) Except for size and color, the square background required by Sec. 172.510(a) for certain placards on rail cars, and Sec. 172.507 for placards on motor vehicles containing a package of highway route controlled quantity radioactive materials, must be as follows:[GRAPHIC] [TIFF OMITTED] TC02MR91.044
(b) In addition to meeting the requirements of Sec. 172.519 for minimum durability and strength, the square background must consist of a white square measuring 14\1/4\ inches (362.0 mm.) on each side surrounded by a black border extending to 15\1/4\ inches (387.0 mm.) on each side. [Amdt. 172-29, 41 FR 15996, Apr. 15, 1976, as amended by Amdt. 172-64, 46 FR 5316, Jan. 19, 1981; Amdt. 172-78, 48 FR 10226, Mar. 10, 1983]