Page:UK Traffic Signs Manual - Chapter 3 Regulatory Signs. 2008 (Second Impression 2008).pdf/160

 of all traffic. For those lanes where the direction of flow is never changed, the green arrow and red cross, as appropriate, will be permanently displayed. These signals must be internally illuminated and identical to those displayed above the tidal—flow lane.

The signs shown in Part II of Schedule 10 to the Regulations are used to inform drivers of a tidal—flow system ahead and to explain the meaning of the lane control signals. The x—height of these signs may be varied from 75 mm to 150 mm and depends on the speed of traffic. Appropriate sizes are specified in Appendix A.

A sign to diagram 5010 is used on a road that leads directly into a tidal—flow system. It gives advance warning of lane control on the road ahead, and explains the meaning of the signals. The white arrow symbol and the legend "move to left" is omitted where the signal to diagram 5005 or 5005.1 is not used. The sign should be sited approximately 200 m before the first signal. A sign to diagram 5012 should be sited between 50 m and 100 m before the first signal. A sign to diagram 5014, omitting the arrow, and varied to indicate the distance to the nearest ten yards, should be sited approximately 400 m before the first signal. Where the 85th percentile speed of traffic is above 30 mph, an additional sign to diagram 5010 might be required. In this case it should be sited 400 m before the first signal, with the sign to diagram 5014 located approximately 800 m before the first signal. Where the road is one way or a dual carriageway on the approach to the tidal—flow section, a sign to diagram 5010, 5012 or 5014, as appropriate, should be provided on each side of the carriageway at each location.

The sign to diagram 5011 is similar to diagram 5010, and is used on a side road that joins a major road within a lane control section. The sign should be placed at least 50 m from the junction to enable drivers to assimilate the information on the sign before diverting their attention to the junction ahead. Where the side road is one way (with two or more lanes) or a dual carriageway, the sign should be provided on each side of the carriageway. Where a side road joins a major road prior to the start of the lane control section, a sign to diagram 5011 should be provided if drivers would not pass a sign to diagram 5010 after turning into the major road. In this case, the sign should be supplemented by a 158