Traffic Signs Manual Chapter 4 Warning Signs
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- 1.10 Mounting 1.10.1.
| 1.9.4.
Appendix A recommends minimum clear visibility distances. These should normally be measured from the centre of the most disadvantaged driving lane. It is important that the full recommended sight line to the whole of the sign face is preserved. Trimming of foliage only in the immediate vicinity of the sign may not be sufficient; sign visibility should always be checked from the appropriate viewing distance. 1.10 Mounting 1.10.1. The normal mounting height measured to the lower edge of a warning sign is between 900 mm and 1500 mm above the carriageway alongside. The greater height should be used where road spray is likely to soil the sign. Where signs are erected above footways, or in areas likely or intended to be used by pedestrians (e.g. pedestrian refuges), a minimum headroom of 2300 mm is recommended, with 2100 mm as an absolute minimum. A clearance of 2400 mm should be maintained over a cycle track or shared cycle track/footway. When supplementary plates are used, the height should be measured to the bottom of the plate. 1.10.2. Plates should be separated from the sign or another plate by a vertical space not exceeding the x‑height of the lettering. 1.10.3. Except where they support a luminaire, posts should not project above the top of the sign. This practice is unsightly, and needlessly increases visual intrusion and clutter. tải về 2.25 Mb. Chia sẻ với bạn bè của bạn:
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