arrow design is modified slightly when it crosses the hard shoulder demarcation line. Figure 13-14 shows the layouts of the complete sign for one and two lanes through the works when there is no top panel. In each case only one additional lane is shown beyond the works. It is not necessary to indicate any additional increase in the number of lanes available (eg two lanes increasing to four would be shown as two lanes increasing to three). Figures 13-15 and 13-16 show how the arrow design is modified when the sign has a top panel and there are one or two lanes through the works respectively. The overall width of the sign is fixed at 2630mm irrespective of the number of lanes indicated. Figure 13-17 shows the sign design for three lanes through the works. It should be noted that, in this case, the design of the arrows is the same whether there is a top panel or not.
13.25 Diagram 7231 is used when the number of lanes through the works, using the hard shoulder, remains the same when rejoining the main carriageway. That part of the red block to the right of the right hand arrow head indicates that the third lane of the main carriageway is closed. This sign could be modified by omitting this part of the red block and adjusting the position of the arrows to indicate that the main carriageway is fully open, and has the same number of lanes as through the works (eg on a two-lane motorway where lane two is closed and traffic runs on the hard shoulder and lane one).
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