Traffic Signs Manual Chapter 4 Warning Signs
tải về 2.25 Mb. Chế độ xem pdf
|
- Điều hướng trang này:
- Table 4-1
- 18.2.1 ). 4.1.3.
| Figure 2-9
& 2.4.2 ) should be used if a significant speed reduction is advisable. These signs must not be used to warn of the termination of a dual carriageway (see 5.1 ). Figure 4-1 Diagram 516 (S2‑2‑13) Figure 4-2 Diagram 517 (S2‑2‑14) Road narrows on both sides ahead Road narrows on one side ahead (Alternative types) Table 4-1 Taper criteria for warning sign 85th percentile speed (mph) Taper Up to 30 1 in 40 31 to 40 1 in 60 41 to 50 1 in 80 Over 50 1 in 100 4.1.2. The signs may be supplemented by edge lines, hatched markings and hazard markers to diagram 560. A supplementary plate “Oncoming vehicles in middle of road” may be used if drivers are likely to be surprised by an oncoming vehicle (see 18.2.1 ). 4.1.3. The sign to diagram 517 should be used in preference to 516 if the narrowing occurs mainly on one side of the road. At the termination of a single carriageway climbing lane, the alignment should place the onus on the overtaking driver to rejoin the nearside lane and the sign to diagram 872.1 is used in advance of the start of the loss of the right hand lane at the distance specified in Table 4-2 , and repeated at half this distance. The second sign is not necessary if the 85th percentile speed is below 50 mph. Details of road marking layouts and tapers for climbing lanes can be found in Chapter 5 and TD 9 in Volume 6 of DMRB. 4.1.4. Where a road with two lanes in one direction, other than a climbing lane, narrows to a single lane, or a road with a single lane in each direction narrows to a single track, an advance warning sign with the appropriate supplementary plate with the legend “Single file traffic” (see tải về 2.25 Mb. Chia sẻ với bạn bè của bạn:
|