Page:UK Traffic Signs Manual - Chapter 3 Regulatory Signs. 2008 (Second Impression 2008).pdf/23

 The "turn left" and "turn right" signs to diagram 606 should be mounted on the left or the right of the signal head respectively. The "ahead only" sign should be mounted on the carriageway side of the signal. The "no left turn" and "no right turn" signs should be mounted on the left or the right of the signal head respectively. Alternatively the signs may be mounted immediately below the green aspect. Where only one manoeuvre is permitted, the signal head should include a green arrow in place of a full green lens, to indicate the direction in which vehicles must proceed. Where both left and right turns are prohibited, a sign to diagram 606 pointing upwards should be used rather than both signs to diagrams 612 and 613. As at priority junctions, the signs at signal-controlled junctions may be supplemented by road markings to diagram 1036.1, 1036.2, 1037.1 or 1038 (see Chapter 5). Where appropriate, a sign to diagram 818.2 or a map-type sign incorporating regulatory roundels may be used on the approach to the junction.

Where there is a left turn filter slip road immediately in advance of traffic signals but not controlled by them, any "no left turn" sign relating to the signals should not be sited with the primary signal head unless this is at least 10 m beyond the plain-faced bollard at the dividing nose. Where the distance is less, the sign should be mounted only on the secondary signal head.

A traffic regulation order restricting the movement of vehicles through a junction may provide exceptions for buses, cycles and taxis. In such cases the signs to diagrams 606, 609, 612 and 613 may be used with a supplementary plate excepting buses, local buses, cycles and taxis as appropriate. Exception plates to diagrams 954, 954.2, 954.3 and 954.4 are rectangular; their appropriate sizes are specified in Appendix A. Exception plates to diagrams 954.5, 954.6 and 954.7 are circular with a diameter of 300 mm for use with signs mounted on traffic signal heads and must be internally illuminated by day and by night.

Supplementary plates to diagrams 607 (One way) and 608 (Dual carriageway) should not be used with signs that have exception plates as this could cause confusion and might be hazardous.

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