D3D3 DESIGN CRITERIA
D3.1GENERAL
D3.1.1 This section gives advice on general design issues. However, not all the following guidance applies to all situations, but these criteria should be followed as appropriate.
D3.2SAFETY CLEARANCES
D3.2.1 The following advice concerns the minimum lateral (sideways), vertical and longitudinal (longways) clearances that should be provided between moving traffic and the works for different types of roads. The establishment of well defined minimum width safety zones, into which workers and plant should not enter in the normal course of work and in which materials should not be deposited, is an essential prerequisite to ensuring safety during road works. An example of a safety zone is shown in Figure 3.1. For safety clearances between opposing flows of traffic on a dual carriageway see Section D6.4.
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Figure 3.1 Safety zones – typical site layout
NOTE: The safety zone extends to the outside edge of the cones or the traffic edge of any road markings or studs that are present separating the live traffic lanes from the work area.
D3.2.2 The outer boundary of the safety zone should always be marked by traffic cones, with the addition of warning lights during darkness, except where marked by a temporary vehicle restraint safety barrier (see Section D3.10). Where the permanent speed limit is greater than 40 mph, the inner boundary should always be
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