Question to the Department for Transport:

To ask the Secretary of State for Transport, what assessment he has made of the number of vehicles using (a) the M4, (b) the M25, (c) the A4 and (d) the local road network to access Heathrow airport in each of the last two years.

As part of the Department’s National Statistics series on Road Traffic, the Department produces annual estimates of the average daily flow of vehicles on the major roads near Heathrow airport. The Department does not know the destination of these vehicles.

The table below provides a breakdown of vehicle flow estimates on sections of (a) the M4, (b) the M25 and (c) the A4 close to Heathrow airport for 2016 and 2017 – the latest years available.

Average Daily Flow Estimates of motor vehicles on the M4, M25, and A4 near Heathrow Terminals – 2016 and 2017

Vehicle counts are collected at a sample of locations on (d) the local road network. These can be accessed via the Department’s interactive map here:

https://roadtraffic.dft.gov.uk/manualcountpoints

Contextual information can be found on the data.gov.uk website here:

https://www.gov.uk/government/collections/road-traffic-statistics