10.19 Where gantry signs indicate a lane drop (diagrams 2908.1 and 2909), the downward pointing arrow is shown on a blue patch placed directly on the gantry structure (i.e. separate from the main sign). The design of this patch is shown in figure 10-10. The slip road gantry sign shown in diagram 2913.4 follows the design rules set out in section 9.
10.20 Symbols, other than the aircraft, ferry and railway station symbols, are not permitted on blue background motorway signs. However, they may be incorporated in all-purpose road destination panels on signs such as those located on exit slip roads and on the approach to a terminal roundabout.
10.21 Similarly, warning and regulatory signs may be incorporated only on motorway signs that include all-purpose road destination panels.
10.22 The design of rectangular direction signs located on the nose of an exit slip road is shown on working drawing P 2910 & P 2910.1.
ROUTE CONFIRMATORY SIGNS ON MOTORWAYS
10.23 The design of route confirmatory signs is similar to those on all-purpose roads as described in paras 8.1 to 8.8. Figure 10-11 shows the appropriate design rules to accommodate the Motorway alphabet used for the route numbers. As for other motorway signs, where the motorway number at the top of the sign is bracketed, the gap to the top border is increased to 4sw. Distances must be to the nearest mile, as fractions are not permitted on motorway signs.
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