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DCAN 15: Vehicular Access Standards
Layout of Other Accesses

10.1 The entry and exit radii shall be sufficient to accommodate the largest vehicle likely to use the access. In most cases 10m radius should be adequate but, where this is not practical, a minimum of 6m may be permitted.
10.2 The minimum width of the access shall be 6.0m for a two-way access and 3.75m for a one-way access.
10.3 The gradient of the access shall not normally exceed 4% over the first 10m outside the public road boundary (see section 13.4 for accesses onto trunk roads). The remainder of the access should have a gradient less than 10% so that it may be used during wintry weather.
10.4 Entrance gates should normally be sited far enough from the edge of the carriageway to allow the largest vehicle likely to use the access to stop clear of the carriageway when the gates are closed. Where this is not possible the provision of a deceleration lane or lay-by may be required. Gates must be hung so that they do not open towards the carriageway or, where this is not possible, sited so that when open they do not project into the public road area.
10.5 It may be necessary to control the internal layout to prevent vehicles queuing back onto the public road. For example, a weighbridge or car park barrier should be located a sufficient distance from the access.
10.6 Where the access crosses a footway it is important to have intervisibility between pedestrians and emerging motorists. In these circumstances there should normally be visibility splays between a driver’s viewpoint 2m back into the access and a distance measured along the back of the footway for 2m on each side of the viewpoint.
10.7 Accesses which are determined for adoption as public roads shall be in accordance with TD 42/95, DMRB 4 - Volume 6, or if within a proposed housing development, the Department’s Design Guide for the Layout of Housing Roads 2
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