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<p>The Government has commissioned studies to assess the impact of vehicle speed on
emissions, for example undertaking a high-resolution emission modelling approach to
understand changes in vehicle speeds and how it relates to emissions. The Department
uses the best available evidence to model emissions in urban areas, including evidence
linking vehicle speeds with emissions based on international guidelines. The evidence
is that the factors influencing emissions are complex and the relative impact of vehicle
speed, acceleration/deceleration and distance travelled (which are all related to
journey times), will vary depending on the local situation.</p><p> </p><p>In addition,
the Government’s Joint Air Quality Unit helps local authorities to calculate NOx emissions
in their local areas using outputs from traffic models, which use a range of parameters
including speed and distance travelled (which influence journey time) and the number
of vehicles. The results of these parameters are contained in their Full Business
Cases which are all published documents.</p>
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