A "turn left" sign (diagram 606) with a "Dual carriageway" plate should be erected on the central reservation opposite the side road (see figure 5-1). If the layout is not self-evident, a map-type sign on the minor road approach might be helpful.ĥ.17 On a side road which joins a dual carriageway road where there is no gap in the central reservation, a "turn left ahead" sign (diagram 609) together with a "Dual carriageway" plate (diagram 608) should be used. Prior approval must be obtained in writing from the Secretary of State before using these signs and markings in such circumstances (see para 5.13). It may also be appropriate to erect "no entry" signs (diagram 616) on each side of the nearer carriageway, angled so as to be seen by a driver attempting a right turn. In such cases, as an additional safeguard, NO ENTRY (diagram 1046) should be marked on the nearer carriageway to prevent drivers from turning right into it. The "Dual carriageway" plate may be provided below these signs also.ĥ.16 Special care is needed in signing minor road junctions with dual carriageway roads if the carriageways are separated by a very wide central reservation and the further carriageway could be mistaken for a separate road or cannot easily be seen by a driver on the minor road. Where advance warning is needed, signs to diagram 501 supplemented by the plates 502 or 503 as appropriate should be erected in accordance with table 2-1. Amended side road signing should be in accordance with para 5.15.ĥ.15 Where a minor road crosses or joins a dual carriageway, GIVE WAY or STOP signs (see Chapter 3) should normally be provided on the minor road, supplemented by a "Dual carriageway" plate to diagram 608 (see para 2.1). diagram 506.1 indicating a side road might have to be substituted for diagram 504.1 indicating a crossroads). Junction warning signs may need to be removed or replaced (e.g. Although not time-limited by direction 37, this should be removed at the same time as the GAP CLOSED sign. A "no right turn" sign (diagram 612) should be placed on the central reservation immediately preceding the former gap. This sign must not be retained for longer than three months (direction 37). It will usually be helpful to add the distance in yards (to the nearest 10 yards) on a separate line after "CLOSED". This should be sited on the central reservation a suitable distance in advance of the closure. See Chapter 3 for further guidance.Ī distance in yards to the nearest ten yards may be added before or substituted for "AHEAD" 5.14 Where a gap in the central reservation of a dual carriageway has been closed, a temporary sign to diagram 7014 (see para 1.17 for guidance on size) varied to "GAP CLOSED AHEAD" should be provided, warning drivers of the changed layout. on 10m wide carriageways).ĥ.12 "Keep left" signs (diagram 610) should always be placed at the start of the central reservation, and at any gaps. NOTE: The larger size shown in brackets may be used on high standard single carriageway roads where speeds are high (e.g. Table 5-2 Size of dual carriageway signs 85th percentile speed Distances greater than two miles are not permitted, as this might result in impatient drivers trying to overtake on an unsuitable length of road.ĥ.11 For guidance on the appropriate x-height for these signs, see table 5-2. This sign may be used to encourage drivers to delay overtaking until the dual carriageway is reached. The sign may display distances of "¼ mile" or "½ mile" only.ĥ.10 Further advance warning up to a distance of two miles may also be given by a sign to diagram 818.1. The sign to diagram 818.1A may be used to warn drivers that a dualled length is short and so might not be long enough to permit overtaking. If the dual carriageway is shorter than 400 metres, no advance sign should be provided. Siting distances, normally measured back from the nose of the central hatch marking at the start of the dual carriageway, are similar to those indicated in Appendix A for warning triangles. 5.9 On a single carriageway road which widens to a dual carriageway for a length of at least 400 metres, an advance sign to diagram 818 should be provided.
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