Heavy Vehicle (Mass, Dimension and Loading) National Regulation (NSW)

The face of a warning sign on a class 1 heavy vehicle or pilot vehicle must have—

a yellow surface complying with class 1, 2, 400 or 100 of the version of AS/NZS 1906‘Retroreflective materials and devices for road traffic control purposes’ applying to the warning sign at the sign’s date of manufacture; and

a black border that is at least 20mm wide and, unless the sign has been made with a box edge, whose outermost edge is at least 10mm in from the edge of the sign; and

its manufacturer’s name or trademark, and the brand and class of material used for the warning sign’s surface, permanently marked in letters at least 3mm but no more than 10mm high—

for a class 1 heavy vehicle—on any visible part of the sign; or

for a pilot vehicle—on any visible part of the sign other than a bottom corner.