When lights show 200 yds' Supplementary Plate - Post Mount Diagram 548.1 R2/RA2This permanent road sign is often used alongside sign face 548 which informs road users that there is a supervised cattle crossing ahead. It informs drivers that when the lights are showing there is a cattle crossing in the stated distance from the sign. This gives drivers plenty of time to slow down. The X height (height of the text in mm) on this sign can be adjusted to suit the road that it is being installed on. This will have an impact on the