HC Deb 30 March 1998 vol 309 cc357-8W
Mr. Matthew Taylor

To ask the Secretary of State for the Environment, Transport and the Regions what assessment his Department has made of the use of increased journey times in urban areas as a means of discouraging travelling by private cars. [35639]

Ms Glenda Jackson

Results from a study of motorists in a report entitled "Responses to Congestion" have been used as the basis for Guidance on Induced and Suppressed Traffic, published in February 1997, in the Design Manual for Roads and Bridges. A brief description of that study is given in Volume 12.2.2 Annexe C of the Manual. That advice recommends using predicted changes to travel times by car and public transport as standard inputs to well established mode choice models, where complex changes to behaviour are expected.

A more recent study of the effects on the volume of road traffic when roads were closed or their capacity restricted for a variety of purposes did not report the effect on journey times.