The road marking to diagram 1036.1 (TURN LEFT) or 1037.1 (TURN RIGHT) may be used to supplement the upright sign (see para 13.6 in Chapter 5). If a sign to diagram 609 is used in advance of the junction, it should be used without a supplementary plate. Where a map-type sign is provided in the side road, this should incorporate the "no right turn" or "no left turn" sign. Where the side road is one way and the main road is a single carriageway with two-way traffic, a warning sign to diagram 522 (two-way traffic ) may be provided (see Chapter 4, para 5.4). This should be mounted above the "no right turn" or "no left turn" sign.
.svg)
Figure 4.3
4.6 Where a major road at a crossroads is one way, the use of signs to diagrams 606 and 609 (see para 4.3) is not appropriate, as traffic can normally proceed ahead from the side road. In this situation, a "no right turn" sign to diagram 612 or a "no left turn" sign to diagram 613 should be used as appropriate. "One-way traffic" signs to diagram 652 should be provided in the major road within 50 m of the junction (see para 4.37).
4.7 Where traffic is prohibited from turning into a side road at an unsignalled T-junction (see figure 4-4), a sign to diagram 612 or 613 as appropriate should be provided at the junction. A map-type advance direction sign, if provided, should indicate the prohibited turn by incorporating a diagram 612 or 613 roundel. This sign could be of the type shown in diagram 2010.1, 2010.2, 2123 or 2124, each showing an alternative route. The road marking to diagram 1036.2 (AHEAD ONLY) may be used to supplement the upright signs. Where the turn into the side road is prohibited because it is a one-way road controlled by "no entry" signs, it might not be necessary to provide signs to diagram 612 or 613. Situations where the "no right turn" and "no left turn" signs might be omitted are where the side road is narrow and of minor importance or where the "no entry" signs can be clearly seen from the main road when approaching the junction. Any map-type advance direction sign should incorporate the "no entry" roundel to diagram 616.
.svg)
Figure 4.4
4.8 If traffic has to turn left or right at an unsignalled T-junction because the ahead manoeuvre is prohibited (see figure 4-5), a sign to diagram 609 may be used together with the road marking to diagram 1036.1 or 1037.1 as appropriate. It is not appropriate to provide a sign to diagram 606 pointing to the left or to the right. A plate to diagram 607 should be used with the sign only where traffic is turning into a one-way road. Any map-type advance direction sign should incorporate the appropriate regulatory roundel (e.g. "no entry" or "no vehicles").
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