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The Department for Transport produces congestion forecasts for certain years using the National Transport Model. The latest forecasts are available at:
However, the first year for which forecasts are provided in this report is 2015. The most recent available set of congestion forecasts for 2010, can be found in: "Road Traffic Forecasts 2008: Results from the Department for Transport's National Transport Model", which is available at:
These forecasts show that congestion, measured in terms of delay on all roads in England was expected to increase by 1% between 2003 and 2010, and decrease by 1% on inter-urban Highways Agency roads.
The Department publishes inter-urban congestion statistics, the latest summary of these is available at:
From the above report, historic delay data for all journeys from July 2005 can be accessed at:
Although there is a break in the data series, this shows that the average length of delay experienced by users of the strategic road network was broadly similar in November 2010 to July 2005.