4COMPULSORY AND PROHIBITED MOVEMENTS
GENERAL
4.1 The signs in this section generally give instructions regarding manoeuvres that must or must not be made. Positive signs tell drivers what must be done; prohibitory signs indicate a forbidden manoeuvre. They cover both junctions and the sections of road between junctions.
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606 Vehicular traffic must proceed in the direction indicated by the arrow
May be used with diagram 515, 515.1A, 515.2, 607, 608, 954, 954.2, 954.3, 954.4, 954.6 or 954.7 The arrow may point to the left, right or straight ahead.
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607 One way traffic
May be used only in combination with diagram 606 or 609
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609 Vehicular traffic must turn ahead in the direction indicated by the arrow
May be used with diagram 607, 608, 954, 954.2, 954.3 or 954.4. The arrow may point to the right
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608 Dual carrigeway
May be used only in combination with diagram 501, 601.1,602, 606, 609 or 610
LIMITED MOVEMENTS THROUGH JUNCTIONS
4.2 The sign to diagram 606 is used to indicate the only route that may lawfully be taken through a junction. It may point horizontally to the left or to the right, or vertically upwards. The sign to diagram 609 is an advance sign indicating a compulsory left or right turn. The signs to diagrams 612 and 613 indicate "no right turn" and "no left turn" respectively. The choice of sign or signs for a particular junction will depend on the road layout, the permitted movements and whether there are traffic signals. The following paragraphs and figures 4-1 to 4-8 cover various situations. See paras 4.16 to 4.18 for the siting of these signs and 4.14 and 4.15 for the use of supplementary plates to indicate exceptions.
4.3 At an unsignalled junction where a side road forms a T-junction with a one-way road (see figure 4-1) and traffic is required to turn in one direction only from the side road, a sign to diagram 606 with a supplementary plate to diagram 607 (One way) should be used. These signs are placed opposite the side road. The advance sign to diagram 609 may be used in the minor road, together with the "One way" plate. Where the main road is a dual carriageway without a gap in the central reservation (see figure 4-2) a traffic regulation order is not required (see direction 7(3)). A sign to diagram 606 pointing to the left is used with a supplementary plate to diagram 608 (Dual carriageway). These signs are placed on the central reservation opposite the side road. Again, the advance sign to diagram 609 may be used, this time with the "Dual carriageway" plate. Where the dual carriageway has a gap in the central reservation and the right turn is prohibited, "no entry" signs to diagram 616 should be erected on each side of the
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