Project: TRAMAQ - Traffic Composition

Reference: UG217

Last update: 09/09/2003 14:55:42


The main objective of this project is to produce a report on traffic classification and area type, in England, suitable for use in air quality measurements from road traffic.


In order to estimate emissions, it is necessary to know the traffic composition (e.g. the proportion of vehicles with catalysts, number of diesel vehicles etc). At the present time, national figures are used but these may not be representative of the situation locally. The purpose of the project is to produce a classification of traffic composition for area type throughout England. The results will be published and, if appropriate, summarised in a Traffic Advisory Leaflet.

The project commenced in May 1999 and is due to be completed in August 2000. A sensitivity analysis has been carried out to determine the most important parameters that influence pollutant emissions. Based on the sensitivity test results and available information (such as National Road Traffic Forecasts, and the Vehicle Marketing Model traffic composition) traffic composition for urban areas is being forecast.

The sensitivity tests found that local information on average speed, vehicle age and weight of large goods vehicles will be important for determining local traffic composition.


TRL Limited
Crowthorne House, Nine Mile Ride, Wokingham, Berkshire, RG40 3GA
+44 (0)1344 773131

Contract details

Cost to the Department: £29,514.00

Actual start date: 20 May 1999

Actual completion date: 10 October 2002


TRL Report PR/SE/583/99 Inception Report for Traffic Composition,
Author: J A Cox
Source: Limited Availability from DfT: Contact

TRL Report PR/SE/613/99 Traffic Composition and Emission Estimates: Draft Interim Report
Author: J A Cox, P I Griffiths, P Emmerson And J Cloke
Source: Limited Availability from DfT: Contact

Departmental Assessment Status: Project completed prior to the implementation of the Departmental publications scheme.