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<p>Prior to the Severn Crossings consultation in 2017 the Government undertook modelling
to assess the impact of the policy to continue tolling at a reduced rate, and on the
possible option of free-flow tolling. The modelling used a version of the M4-CAN traffic
model extended to take account of the impact of changes in tolls on both the South
West of England and Wales and included estimates of wider economic impacts consistent
with DfT Transport Appraisal Guidance.</p><p> </p><p>The Government announced on 21
July 2017 that it was removing tolls by the end of 2018. No further modelling was
undertaken by the Department for Transport on this specific option.</p>
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