Mobile Vehicle Activated Signs

The parish council has purchased two mobile Vehicle Activated Signs (mVAS) to rotate around our approach roads.  These will monitor, and hopefully reduce, speeding through the village.  The data (records volumes and speeds, not individual registration plates) may be used by Thames Valley Police to more effectively target any speed enforcement activity or by Buckinghamshire Council when considering requests for speed mitigation measures.  

mVAS sites have been approved by Transport for Bucks in Vicarage Road, Cheddington Road, Marsworth Road and Westfield Road.  Units must rotate around these locations and can’t be permanently deployed at any one site. None of these 4 locations meet the necessary Department for Transport (DfT) criteria for a permanent VAS.

The output reports are discussed at full parish council meetings, which are open to the public.

More information relating to managing vehicle speeds can be found on the Buckinghamshire Council website here: https://www.buckscc.gov.uk/services/transport-and-roads/road-safety/managing-speed/

Please note that the data is recorded at the point that the vehicle comes into the line of sight for the mVAS (approximately 100m). If the vehicle is travelling at over 35mph, the mVAS will flash a warning to the driver. Speed data is recorded for all vehicles whether or not the MVAS flashes. It is set to 35mph to allow for tolerances within both the vehicle and unit recording equipment etc. The unit can’t record any remedial action taken by the vehicle ie it won’t show if that vehicle slowed down once the flash was triggered.

There are two locations listed in the table for Westfield Road. The approved Westfield Road location is opposite the Durham Road junction and detects vehicles approaching from the area around the top Windsor Road junction. The second Westfield Road unit was located by the Quarry Road junction to detect vehicles around the Warwick Road junction.

A table of the latest results is shown below:

In the table 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.

Location85th percentile speedAverage speed
Cheddington Road36.2mph29.88mph
Marsworth Road26.2mph21.54mph
Vicarage Road29.8mph25.2mph
Westfield Road34.9mph29.17mph
Westfield Road/Warwick Road junction36.8mph29.71mph
mVAS data

The report for Westfield Road, following the relocation of the speed signs by Buckinghamshire Council is attached, along with all subsequent reports. Please note the reports includes the raw data as well as summaries and graphs and may be over 100 pages so be careful if you choose to print.

Also attached is the latest version of the mVAS policy and manual.

Once all the proposed traffic calming measures had been installed, Buckinghamshire Council installed pneumatic monitoring strips across Westfield Road, inside the 30mph zone & before the Warwick Road junction. These are more accurate, and measure vehicle speeds and classifications for vehicles travelling in both directions, as they pass over the physical strips. The full report can be found via this link: https://pitstone.co.uk/ppcnews/westfield-road-pneumatic-strip-speed-classification-report/ The summary data to replicate the above table is below for your convenience.

Location85th percentile speedAverage Speed
Westfield Road/pneumatic strips 45/4537/38

Attachments:

  1. https://pitstone.co.uk/wp-content/uploads/2013/05/mvas-manual-policy-2023.pdf
  2. https://pitstone.co.uk/wp-content/uploads/2013/05/2021-Feb-Westfield-Road-following-relocation-of-speed-sign-to-Warwick-Road-to-22-Feb.pdf
  3. https://pitstone.co.uk/wp-content/uploads/2013/05/2021-Westfield-Road-report-to-22-Feb-to-26-March.pdf
  4. https://pitstone.co.uk/wp-content/uploads/2013/05/2021-May-17-Westfield-Road-Flashing-Unit-report.pdf
  5. https://pitstone.co.uk/wp-content/uploads/2013/05/2021-May-17-Westfield-Road-Non-Flashing-Unit-by-Warwick-Road-junction.pdf
  6. https://pitstone.co.uk/wp-content/uploads/2013/05/Westfield-Road-non-flashing-sign-by-Warwick-Road-to-July-2021.pdf
  7. https://pitstone.co.uk/wp-content/uploads/2013/05/Westfield-Road-flashing-sign-July-2021.pdf
  8. https://pitstone.co.uk/wp-content/uploads/2013/05/2021-Sept-Westfield-Road-flashing-sign-report-in-pdf.pdf
  9. https://pitstone.co.uk/wp-content/uploads/2013/05/2021-Nov-Westfield-Road-flashing-pdf-report.pdf
  10. https://pitstone.co.uk/wp-content/uploads/2013/05/2021-Nov-West-Rd-Warw-Rd-non-flashing.pdf
  11. https://pitstone.co.uk/wp-content/uploads/2013/05/2022-Feb-14-Westfield-Road-flashing-AFTER-TW-BC.pdf
  12. https://pitstone.co.uk/wp-content/uploads/2013/05/2022-Feb-14-westfield-road-non-flashing-after-TW-BC-OK.pdf
  13. https://pitstone.co.uk/wp-content/uploads/2022/06/Westfield-Road-Feb-March-22-Non-Flashing.pdf
  14. https://pitstone.co.uk/wp-content/uploads/2022/06/Westfield-Road-Feb-March-2022-Flashing.pdf
  15. https://pitstone.co.uk/wp-content/uploads/2013/05/2022-July-Vicarage-Road.pdf
  16. https://pitstone.co.uk/wp-content/uploads/2013/05/2022-July-Cheddington-Road.pdf
  17. https://pitstone.co.uk/wp-content/uploads/2013/05/Oct-22-Westfield-Road-report.pdf
  18. https://pitstone.co.uk/wp-content/uploads/2013/05/oct-22-marsworth-road.pdf
  19. https://pitstone.co.uk/wp-content/uploads/2013/05/Dec-22-Cheddington-Road.pdf
  20. https://pitstone.co.uk/wp-content/uploads/2013/05/Dec-22-Vicarage-Road-report.pdf
  21. https://pitstone.co.uk/wp-content/uploads/2013/05/Marsworth-Road-Feb-23.pdf
  22. https://pitstone.co.uk/wp-content/uploads/2013/05/Westfield-Road-lamp-post-pdf-report-Feb-23.pdf
  23. https://pitstone.co.uk/wp-content/uploads/2013/05/2023-April-Cheddington-Road-report.pdf
  24. https://pitstone.co.uk/wp-content/uploads/2013/05/2023-April-Vicarage-Road.pdf
  25. https://pitstone.co.uk/wp-content/uploads/2013/05/2023-May-Westfield-Road-report.pdf
  26. https://pitstone.co.uk/wp-content/uploads/2013/05/2023-May-Marsworth-Road.pdf
  27. https://pitstone.co.uk/wp-content/uploads/2013/05/2023-July-Vicarage-Road-report.pdf
  28. https://pitstone.co.uk/wp-content/uploads/2013/05/2023-July-Cheddington-Road-report.pdf
  29. https://pitstone.co.uk/wp-content/uploads/2013/05/2023-August-Westfield-Road-Warwick-Road-junction-report.pdf
  30. https://pitstone.co.uk/wp-content/uploads/2013/05/2023-August-Marsworth-Road.pdf
  31. https://pitstone.co.uk/wp-content/uploads/2013/05/2023-Oct-Vicarage-Road-report.pdf
  32. https://pitstone.co.uk/wp-content/uploads/2013/05/2023-Oct-Cheddington-Road-report.pdf
  33. https://pitstone.co.uk/wp-content/uploads/2013/05/2023-December-Westfield-Road-groundscrew-report.pdf
  34. https://pitstone.co.uk/wp-content/uploads/2013/05/2023-December-Marsworth-Road-report.pdf
  35. https://pitstone.co.uk/wp-content/uploads/2013/05/2024-Jan-Ched-Rd-report-pdf.pdf
  36. https://pitstone.co.uk/wp-content/uploads/2013/05/2024-Jan-Vic-Rd-report-pdf.pdf
  37. https://pitstone.co.uk/wp-content/uploads/2013/05/2024-Mar-Westfield-Road-lamp-post-pdf.pdf
  38. https://pitstone.co.uk/wp-content/uploads/2013/05/2024-Mar-Marsworth-Road.pdf
  39. https://pitstone.co.uk/wp-content/uploads/2013/05/2024-April-Cheddington-Road-report.pdf
  40. https://pitstone.co.uk/wp-content/uploads/2013/05/2024-April-Vicarage-Road.pdf
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