5MAP TYPE ADVANCE DIRECTION SIGNS
GENERAL DESIGN CONSIDERATIONS
5.1 Although the geometric layout of the junction will, in general, determine the design of a map type sign, there is flexibility in adjusting the shape of the route symbol and in the positioning of destination blocks and panels. Some designs may be more pleasing in appearance or more economical than others and in many cases can improve the clarity of the sign. See figures 11-8 to 11-12 for illustrations of alternative layouts for a selection of signs.
WIDTH OF ROUTE ARMS
5.2 The width of each route arm on map type signs is generally related to the status of the route indicated. 6sw is used for primary routes and motorways, 4sw for numbered non-primary routes and 2.5sw for unnumbered local routes. Where a bracketed route number is indicated along an unnumbered local route, the route arm width is 4sw. An example of a sign showing the various route arm widths is shown in figure 5-1. A special width of 5sw is used for all routes indicated on a grade separated junction advance direction sign (see figure 5-11). A width of 5sw is also used for the approach arm on the special map type roundabout sign located on the exit slip road at a grade separated junction (see figure 5-24).
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