Page:UK Traffic Signs Manual - Chapter 7 -The Design of Traffic Signs 2013.pdf/52

 the junction. They may also be shown on advance direction signs on exit slip roads.

Some junction layouts have two consecutive exit slip roads, and a sign to diagram 2013 (or non-primary route equivalent) would be appropriate. It is also possible that two junctions are so close together that it is not practicable to sign each one separately. In this case a variant of diagram 2013 is used, showing the distance to each junction. The additional design details for grade separated junction signs with two side arms are shown in figure 5-12. Both side arms should be the same length and, where possible, all destination blocks should be ranged left. Where a block ranged left would be spaced more than 4sw horizontally from its associated route arm, the block may be moved to the right to ensure that it is still associated with the arm. It should be noted that these signs must not include forward destinations. The final advance direction sign for the first exit slip road should be to diagram 2014 or 2101.2, with forward destinations that include those places reached by leaving at the second exit.

Figure 5-13 shows the basic design of the route symbol and the appropriate gaps to the sign borders. The roundabout itself always has a width of 5 sw, whatever the status of the routes at the junction. The approach and exit arms follow the normal design rules, except that the minimum length of any exit arm is 12sw. The minimum length of the approach arm is 8.5sw (there is no maximum length).

Where the right turn arm is below the horizontal, the cut-out in the roundabout symbol has to be adjusted. An example is shown in figure 5-14. The recommended minimum angle for the cut-out is 25°. It may be necessary to move the approach arm to the left, as shown in figure5-15. The purpose of the cut-out is to emphasise that all traffic must travel in a clockwise direction.

Where a roundabout is offset from the main direction of travel, it may be appropriate to show a curved approach arm on the advance direction sign. An example is shown in figure 5-16.

Where two normal roundabouts are close together, or form a single junction, a special symbol is used. This is shown in figure 5-17, together with typical variations in layout. It should be noted that the two roundabout symbols never touch each other and that the connector between them is always 5sw wide, irrespective of the status of the various routes at the junction. The connector may be lengthened should this reflect the actual road geometry more accurately.

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