A1 APPENDIX TABLES
| Road Type | Single carriageway road (permanent speed limit of 30mph or less) | Single carriageway road (permanent speed limit of 40 mph) | Single carriageway road (permanent speed limit of 50mph or more) | Dual carriageway road (permanent speed limit of 40 mph or less) | Dual carriageway road (permanent speed limit of 50 mph or 60 mph) | Dual carriageway road (national speed limit) | ||||
|---|---|---|---|---|---|---|---|---|---|---|
| Relaxation | Relaxation | Relaxation | ||||||||
| Rate of taper (see Note 3) | 1 in 13 | 1 in 20 | 1 in 25 | 1 in 25 | 1 in 40 | 1 in 55 | 1 in 40 | |||
| Taper length (m) for hazard of standard carriageway width between 3.6 m and 4m | 50 | 80 | 100 | 100 | 100 | 150 | 150 | 200 | 150 | |
| Minimum number of cones | 18 | 28 | 68 | 35 | 35 | 101 | 51 | 135 | 51 | |
| Taper See Note 8 for spacing of cones in 45° tapers | Minimum cone size (mm) | 450 | 450 | 750 | 750 | 450 | 750 | 750 | 1000 (see Note 5) |
1000 (see Note 5) |
| Maximum cone spacing (m) | 3 | 3 | 1.5 | 3 | 3 | 1.5 | 3 | 1.5 | 3 | |
| Maximum warning light spacing (m) | 9 | 9 | 9 | 9 | 9 | 9 | 9 | 9 | 9 | |
| Longitudinal | Minimum cone size (mm) | 450 | 450 | 750 | 750 | 450 | 750 | 750 | 750 (see Note 5) |
750 (see Note 5) |
| Maximum cone spacing (m) | 9 | 9 (see Note 1) |
9 | 9 (see Note 1) |
9 (see Note 1) |
9 | 9 (see Note 1) |
9 | 18 | |
| Maximum warning light spacing (m) | 9 (see Note 2) |
9 (see Note 2) |
18 | 18 | 18 | 18 | 18 | 18 | 18 | |
173
