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ROAD NARROWS
| 85th percentile speed | Size of arrow/head | x-height of legend | First signs on approach | Second signs on approach | ||
|---|---|---|---|---|---|---|
| Distance to start of taper | Legend | Distance to start of taper | Legend | |||
| (mph) | (mm) | (mm) | (m) | (m) | ||
| Up to 30 | 240 | 120 | 451 | None | None | None |
| 31 to 40 | 240 | 120 | 135 | 150 yds | None | None |
| 41 to 50 | 320 | 160 | 180 | 200 yds | None | None |
| 51 to 60 | 320 | 160 | 270 | 300 yds | 135 | 150 yds |
| Over 60 | 400 | 200 | 360 | 400 yds | 180 | 200 yds |
| Motorway2 | 400 (480)3 | 200 (240)3 | 800 | ½ mile | 3604 | 400 yds |
NOTES
- On two-lane carriageways subject to a 30 mph speed limit, a single sign mounted on the side of the road on which the lane is to be lost may be adequate, although the possibility of obscuration by parked vehicles should be considered.
- Also all-purpose dual three-lane carriageway roads subject to a 70 mph speed limit.
- Bracketed dimension is used where there are four or more lanes.
- A third pair of signs should be provided at a distance of 180 m indicating a distance of 200 yds.
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