4LONGITUDINAL LINES
CENTRE LINES
4.1 The 1994 Regulations introduced new markings intended for use as centre lines separating opposing flows of traffic on single carriageway roads. These are illustrated in figure 4-1 and the dimensions and recommended applications are shown in table 4-1. Diagram 1008 is used where the speed limit is 40mph or less, and 1008.1 where the speed limit is more than 40 mph.
| Diag No. | Speedlimit(mph) | Mark(m) | Gap(m) | Width(mm) | Spacing of studs(if used) (m) | Description |
|---|---|---|---|---|---|---|
| 1008 | 40 or less | 2 | 4 | 100 | 12 | Two-lane roads, not less than 5.5 m in width |
| 1008 | 40 or less | 2 | 4 | 150 | 6 | Two-lane roads 10 m or more in width (or three lanes marked as two in one direction and one in the other)
Four lanes or more (see para 4.3) |
| 1008.1 | Over 40 | 3 | 6 | 100 | 18 | Two-lane roads, not less than 5.5 m in width |
| 1008.1 | Over 40 | 3 | 6 | 150 | 9 | Two-lane roads 10 m or more in width (or three lanes marked as two in one direction and one in the other)
Four lanes or more (see para 4.3) |
4.2 All new installations and reinstatements must use diagrams 1008 and 1008.1 for centre line markings (where warning lines and double line systems are not appropriate) in place of old markings to diagram 1005.
4.3 The marking should be used only on single carriageway roads. Where the road comprises one lane in each direction, the 100 mm wide marking will normally be sufficient. On four-lane roads, three-lane marked as two in one direction and one in the other, or two-lane 10m wide, the 150mm marking should be used. Any lane lines should be 100 mm wide (see paras 4.7 to 4.11). The centre line should never be narrower than the lane line (see para 4.10). It may be
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