Page:UK Traffic Signs Manual - Chapter 7 -The Design of Traffic Signs 2013.pdf/65

MAP TYPE ADVANCE DIRECTION SIGNS The diameter of the roundel, in stroke widths, varies according to the type of prohibition indicated. A list of roundel sizes is given in Appendix D.

The alternative route message shown in figure 5-37 has an X-height 80% of the main X-height. To compensate for the smaller tiles, any vertical space directly below the legend is increased by 0.5sw, based on the main X-height. Thus the normal vertical space above the inclined route arm is increased from 1.5 sw to 2sw (see para 3.37).

Where a "no right turn", "no left turn", "no entry" or "no vehicles" regulatory sign is used on a map type sign, the section of route arm beyond the roundel is omitted. The banned turn signs are always placed on the arm of the junction into which traffic may not turn, and not on the approach arm. The "no vehicles" regulatory roundel must always be used with a "No vehicles" supplementary plate which may include a distance, as shown in diagram 2009. The vertical space between the "No vehicles" legend and any distance is 2sw, based on the X-height of the plate.

The minimum distance between any roundel or plate and any sign border is 2.5 sw.

The dimensions relating to the various gaps apply equally to plates with and without borders and to roundels with and without white edges. The gap is measured to the outside of any border or edge provided.

Figure 5-39 shows triangular warning signs added to route arms inclined at 30° above the horizontal. Where a distance plate is added, care has to be taken to shape the cut line through the arm. This will vary according to the length of the plate and the size of triangle. The cut-out radius of 4sw (3 sw for a plate without a border) applies only where the arm intersects both the triangle and the plate. In other circumstances a curved cut-out in the arm will be offset by 1.5 sw from either the corner of the triangle or plate as appropriate.

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