(2) which routes accounted for the most delayed journeys on motorways and trunk roads in each year since 1997; and what the average delay on each of these routes was in each of those years.
Figures for total and average vehicle delay for individual routes on England’s motorways and trunk roads have been placed in the House Libraries. These present delays in respect of all journeys and the worst 10 per cent. of journeys in each year since 2004-05. The earliest available data are for the period August 2004 to July 2005 and the latest for January 2007 to December 2007. Data before 2004-05 are not held on this basis.
These figures represent average daytime delays (6.00 am to 8.00 pm) on the 91 routes currently used for monitoring performance on the strategic road network. Figures are presented on a rolling year basis.
Delay is calculated as the difference between observed journey time and a reference journey time (the time that could theoretically be achieved when the traffic is free flowing).
Figures for average delays on motorways and trunk roads for individual regions are not calculated on this basis.