1. Font:
Height: 35 cm
Colour: Monochrome: Red or Yellow
Double color: Green represents safe speed; Red represents overspeed
2. Number: 2 or 3 characters
Screen size: 70*40 cm, three-digit, if two-digit, screen size 40*46 cm.
Box size: 80*55*7 cm, thickness is 7 cm
