The methodology used to formulate the economic model for developing a rural road speed limit policy for DfT is employed to assess the same issues for the trunk road network, with its different flow and vehicle mix. Minimum cost curves are established for Motorways and Dual Carriageways and the assumptions used in generating these are discussed. Target speed limits for the various road types, are reviewed in terms of their comparison with local routes and with international equivalents and threshold accident rates are defined, to identify routes where these target limits do not appear appropriate. The length of roads in the whole of the current network, and in the core network alone, that would be affected by such thresholds at present accident rates is assessed. Other potential descriptive factors differentiating such sections are discussed and the issues involved in using different limits based on transient features such as poor weather or restricted lanes are considered. Potential measures for improving the safety of higher risk parts of the network, to achieve a lower accident rate, are discussed. The application of the strategy is set out and the report sets out the objectives for applying the policy.

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