Devizes Strategic Development Brief - Wiltshire Council

i. Network and Zone Plan updates;
ii. Update the existing model to the appropriate base year for both AM and PM peaks;
iii. The development of an Inter-Peak model for the base year, (traffic generation between the
AM and PM peaks);
iv. Validation and Calibration of the model;
v. Development of a Forecast Model to 2016 for the AM and PM peaks and Inter-Peak;
vi. Option testing (options considered for the highway network can include land use changes,
modal shift, infrastructure solutions e.g. junctions changes);
vii. Written report.
3 Cost of Modelling Work
3.1 Mouchel Parkman has indicated that the basic work required to update the SATURN Traffic
Model for Devizes, e.g. updating the network, traffic counts, new housing numbers etc, would
cost in the region of £60,000 at 2004 prices.
4 Contributions Required
4.1 The County Council is seeking a sum of around £150 per house for the update of the
SATURN Traffic Model from each of the allocated sites in the Brief. However, the County
Council has agreed to discount this figure for sites that have already prepared full transport
assessments and sites that will have a more limited traffic impact on the overall town highway
network. The County Council has therefore agreed to discount this figure by around 15% for
the Le Marchant site, 75% for the Northgate/Wharf/Hospital site and by 50% for the
Spitalcroft allotment site. The contributions are noted in Table 1 below.
4.2 Based on £150 per house, the allocated sites would contribute £76,425 towards updating the
Traffic Model. This would be sufficient to conduct the basic work required to update the
existing model and provide a future year model to be tested. The remaining funds could be
directed towards testing and comparing more complicated future traffic scenarios such as the
provision and effects of new transport infrastructure e.g. new junctions etc.
4.3 In addition to the allocated housing sites, any other housing development comprising 10 or
more dwellings will be required to contribute a maximum of £150 per house towards the
update and potential testing of the Devizes SATURN Model.
Table 1: Contributions Required for SATURN Modelling Update
SITE
HOUSES
CONTRIBUTION
AGREED
PROPOSED
CONTRIBUTION
QUAKERS WALK 230 34500
NAUGHTON AV 100 15000
LE MARCHANTS BARRACKS 130 16800 16800
ROUNDWAY MILL 30 4500
NORTHGATE/WHARF/HOSPITAL 150 5625
SUB TOTAL 640 £76,425
WINDFALL SITES
SPITAL CROFT 130 8400
KVERNELAND 130 19500
TOTAL 900 £104,325
*These figures would be indexed linked as with the Brief.
Kennet Local Plan 2011
Devizes Strategic Development Brief
Supplementary Planning Guidance March 2004
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