Socket mounted location
Types 1,2,3 : 300mm to 400mm outside hard shoulder / hard strip.
Type 4 Offside : 300mm to 400mm outside carriageway.
Type 4 : Central Reserve on central line of centre reserve.
Type 5 : Centre line of centre reserve. |
TYPE 1 
The most commonly used post. |
TYPE 3 
Countdown markers to crossings installed on both approaches to the crossing in place of type 1. |
TYPE 2  |
TYPE 4 
This post is used on the central reserve when there is no crash barrier. |
Spacing
All posts are positioned at 100m intervals. |
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Type 3(3), 7(3) and 8A(3), at 300m. Type 3(2), 7(2) and 8A(2) at 200m. Type 3(1), 7(1) and 8A(1) at 100m from crossing. |
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