6DEDICATED LANE ADVANCE DIRECTION SIGNS
GENERAL DESIGN RULES
6.1 Figure 6-1 shows the design of a sign for an at-grade junction where the right hand lane is for use by right turning traffic only. Such a sign may also be used on the exit slip road of a grade separated junction.
6.2 Figure 6-2 shows a main carriageway advance direction sign on the approach to a grade separated junction with a lane drop. Figure 6-3 is the final advance direction sign used at lane drop junctions. Details of the chevron markings in figure 6-3 are shown in figure 6-4.
6.3 For all signs covered in this section, the longer 18sw arrow replaces the standard 16sw length. The width of the arrow head remains at 8sw. The tops of arrows are always aligned vertically. The curved arrow in figure 6-1 is reversed when indicating a left turn lane. Where two or more lanes lead to the same destination, a horizontal bar is used as shown. This also applies to multiple left and right turn lanes. Where there is no bar, the gap between legend and arrow head is generally 1.5 sw for tiles and 2.5 sw for panels, patches and symbols. The gap may be increased to produce a balanced design (e.g. by aligning the destination blocks, as shown in figure 6-2). However, this increased gap is not recommended for signs with chevron markings (see figure 6-3) where this would increase the width of the sign.
6.4 The arrows, including any left or right turn arrows, are centred horizontally in their respective lanes (in the case of the curved arrow it is the full 14sw width that is centred). This does not necessarily apply to the inclined arrow shown in figure 6-3, where the position is chosen to give a balanced appearance. Lanes leading to the same destination should have equal width. The widest lane on the sign should not be greater than twice the width of the narrowest lane. If necessary, the width of the narrow lanes should be increased and the legend centred accordingly. Any horizontal bar should extend to a point 2.5sw from any vertical border or lane line.
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