O3.2.21 On motorways and dual carriageway roads the provision of a site access lane as shown in Figure 3.3 may be required on major reconstruction works. The lane shall be kept free from plant and materials, but may be used temporarily by broken-down vehicles in order to keep the running lanes clear. The safety zone should be located between the live highway and the access lane if the site access traffic is required to stop, or between the access lane and the works if site access traffic is unlikely to stop. The safety zone should be not less than 1.2 m wide, except that, where it is located between the access lane and the works, it may be reduced to not less than 0.50 m if a temporary speed limit of 40 mph or less is applied to the access lane.
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Figure 3.3 Location of safety zones in relation to site access lane
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