Data check - Change in congestion on inter-urban roads 2008-11

In the year to February 2011, the provisional figure for average vehicle delay on the slowest ten per cent of journeys on inter-urban roads was 3.44 minutes per ten miles, 11.8 per cent lower than the baseline year ending March 2008. This is equivalent to a saving of 27 seconds per ten miles or the average speed on the slowest ten per cent of journeys rising from 44.3 mph to 45.8 mph. The route showing the greatest increase in delays since March 2008 is the M25 motorway between junctions 16 and 23.

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