Highways Act Orders and Schemes

New grade-separated junctions
2.15 The plan should show the full extent of the new trunk road line and slip roads as
solid black lines, and to show the existing roundabout and connecting roads as
new highways with black and white dashes.
Numbering and lettering
Line Order
2.16 The start and end points of the new trunk road should be lettered A and B (and
the route and distance will be described in the line Order Schedule). Where
there are a number of sections, the lettering will continue C - D, E - F etc, working
across the plan from left to right. Slip roads will be numbered 1, 2 etc (and also
described in the Line Order Schedule).
Detrunking Order
2.17 The route to be detrunked should be marked with broad black dashes and
lettered at either end of each section of detrunking (and the route and distance
will be described in the detrunking Order Schedule). Care should be taken to
identify the precise extent of the route to be detrunked to ensure that the whole
route is included.
2.18 Where a section of trunk road is to be stopped up there is no requirement to
include it in the detrunking Order. On occasion, it may be appropriate to close a
part width of a trunk road whilst detrunking the remainder, for example where one
carriageway of an existing trunk road will be retained as a local road but the other
is being stopped up.
2.19 On the detrunking Order plan, the treatment is to show the existing roundabout to
the point where it links to the local road network as ‘road ceasing to be trunk road’.
Trunking Order
2.20 Trunking is handled in a similar way to detrunking. It is shown by an open ladder
marking and lettered at each end of the section to be trunked.
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