Westfield Road pneumatic strip speed & classification report

As part of the remedial measures undertaken, Buckinghamshire Council agreed to install a pneumatic monitoring strip to assess the speed and classification of vehicles at the location of the changes.

The two result reports provided by Buckinghamshire Council are available here:

The mVAS reports, which show the data from the mobile flashing speed units from further down Westfield Road are available on this webpage: https://pitstone.co.uk/ppcinfo/mobile-vehicle-activated-signs/

In all the reports, the “Average Speed” is the mean average calculated for all vehicles. The ’85th Percentile Speed’ shows the speed at, or below, which 85% of vehicles were travelling. It is used by the DfT (and other organisations around the world) as a measure of the ‘actual’ speed of the road as compared to the speed limit. Unlike the mean it is not skewed by vehicles travelling below the limit.

The 85th percentile for the 3 locations shows 85% of vehicles are travelling at, or below, 45mph at the point of the new measures (recorded by the pneumatic strips), decreasing to 40mph by the first mVAS (around the Warwick Road junction), then decreasing to 35mph by the second mVAS (opposite Bolebec End).

An initial decrease in speed following the introduction of the measures is no longer evident.

Following receipt of the report:

  • The Parish Council asked for the data to be referred to the Road Safety division of Buckinghamshire Council. They have reviewed all the data available for this location, and advised that “unfortunately, we would not look to install any remedial measures here as there is no injury collision history at the site.” The Buckinghamshire Council highway policies, including their Network Safety Policy, are available via this link: https://www.buckinghamshire.gov.uk/parking-roads-and-transport/policies/highway-policies/
  • Buckinghamshire Council agreed that the speeding did represent an enforcement issue and they “passed the data to the police authority with a request for tasking. It will be up to the police authority to determine if they will make Westfield Road an enforcement site.” Thames Valley Police have since undertaken one speed monitoring exercise along Westfield Road. Once we have any firm information from them about ongoing activity we will keep you posted.
  • We’d raised a separate request with Taylor Wimpey to cut back the roadside shrubs/verge to improve visibility of the gates.
  • The BC Community Board, initially assisted with Westfield Road issues. The parish council has escalated the reports and subsequent activity to Buckinghamshire Councillors Town and Brazier (who sit on the Board) to see if this group can offer any further assistance/input.
  • Residents may also be interested in registering an interest to become a volunteer for a Community Speedwatch program. More details available via this link: https://pitstone.co.uk/ppcnews/speedwatch/


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