13.14 Although vertical lane lines are optional, they should always be used to differentiate between different destinations in diagram 7201. The length of the line is variable and may extend to the top of the panel should this give a clearer indication of the appropriate lanes to be used by traffic. The lane line shown in figure 13-6 does not extend to the top of the panel, as M1 traffic can use all lanes. Where two or more lanes lead to the same destination which is shown only once, a horizontal bar should be used as shown. Where two adjacent arrows are both to diagram 7285 or 7286 and show the same route number, a horizontal bar is not used (see diagram 7233 as an example).
13.15 The horizontal spacing of elements in the centre panel is shown in the table in figure 13-4. It should be noted that the sign should contain at least one of the elements shown in diagrams 7281 to 7286 inclusive. Where the sign would be made up only from a combination of diagrams 7280 and 7287 or 7288, a "wicket" type sign from the 7202 to 7209 series should be used instead of diagrams 7201 or 7201.1. The only exception to this rule is where diagram 7264 (NARROW LANES) is required as a top panel on diagram 7201.
13.16 Where the overall width of the sign is determined by either the top or bottom panel, the horizontal spaces between the individual arrows should be increased. Where arrows are equally spaced, the increased space should be split equally between each arrow. Where the arrows are not equally spaced (see table in figure 13-4) the additional space should be apportioned so that the arrows approach equal spacing. Should equal spacing be achieved before using up all the additional width, the remaining space would be split equally between each arrow. An example is shown in figure 13-7.
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