Question to the Department for Transport:

To ask Her Majesty’s Government how much they estimate that traffic congestion costs the economy in time wasted (1) in London, and (2) in the 21 most congested UK cities, according to the 2016 INRIX report <i>Europe's Traffic Hotspots: Measuring the Impact of Congestion in Europe</i>.

The Department for Transport does not routinely estimate congestion costs however, as part of the Eddington study in 2006, the Department estimated congestion costs in the most congested Local Authorities and in 2009 published a congestion map as part of the DASTS (Delivering A Sustainable Transport Strategy) City and Regional Networks Data Book showing the most congested towns and cities. The DASTS Databook Annex14 is available at:

http://webarchive.nationalarchives.gov.uk/20090511045027/http://www.dft.gov.uk/pgr/regional/strategy/databook/

However, due to both the use of different methodologies, geographies as well as the age of the above analysis, it is not possible to compare the Departments historic analysis of congestion costs with those of INRIX.