Appendix A
.
2.4.5. Where further emphasis is needed on high‑speed approaches on dual carriageway
roads, the countdown markers to diagrams 823, 824 and 825 may be used, sited 300, 200
and 100 yards respectively from the give way line. The background colour must be changed
to green when used on a primary route, and white (with black symbols and border) on a non‑
primary route. The signs should normally be mounted in pairs on each side of the carriageway,
with the signs on the central reservation being reversed so that the bars incline downwards to
the left.
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