Traffic Signs Manual Chapter 4 Warning Signs
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above. 2.3.5. A distance plate should be used when the distance between the sign and the merge point is different from that recommended in Appendix A (but see 1.9.1 ). 2.4 Roundabouts 2.4.1. The sign to diagram 510 (S2‑2‑7, see Figure 2-8 ) should not be used to indicate the approach to a roundabout where adequate warning is conveyed by a map‑type advance direction sign or where the roundabout is clearly visible to approaching drivers. It may be used with supplementary plates to diagram 511 (S2‑3‑1), 513.1A (S2‑2‑4) or a distance. “Adverse camber” may be used in place of the 513.1A lorry adverse camber plate. The roundabout warning sign should be used only for true roundabouts. It should not be used to give advance warning of a gyratory system or where the approach to an otherwise standard roundabout is controlled by signals. 2.4.2. On high standard all‑purpose dual carriageway roads subject to a speed limit of 70 mph, diagram 510 should be used in addition to the map‑type advance direction sign and be supplemented by a plate to diagram 511 “REDUCE SPEED NOW” (see Figure 2-9 ). One sign and plate should be situated on the central reservation 500 m in advance of the roundabout, with a duplicate on the left side 450 m in advance (see also tải về 2.25 Mb. Chia sẻ với bạn bè của bạn:
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