Diagram number and
sign location
85th percentile speed of private cars (mph)
Up to 30
31 to 40
41 to 50
Over 50
530A mounted on structure
900
1200
1500
1800
530A on approach
750
900
1200
1500
531.1 on approach
750
900
1200
1500
532.2
750
900
1200
1500
532.2A
900
1200
1500
1800
532.3 (centre of arch)
750
900
1200
1500
532.3 (side of arch)
600
750
900
1200
532.3A (centre of arch)
900
1200
1500
1800
532.3A (side of arch)
750
900
1200
1500
629.2 mounted on structure
600
750
900
1200
629.2 on approach
600
750
900
1200
629.2A mounted on structure
750
900
1200
1500
629.2A on approach
750
900
1200
1500
NOTES
1. For further guidance on clear visibility distance, see
1.9.3
and
1.9.4
. Siting also needs to take account
of the location of other signs (e.g. advance direction signs) to ensure that one sign does not obstruct the
sight line to another. Provision of a new sign might sometimes require the relocation of an existing one.
2. For further guidance on sign siting, see
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