Monday, 16 April 2018

Peffermill Road

Following concerns expressed about safety near the entrance to the University Peffermill Playing Fields I though it might be helpful to share the analysis carried out by our Road Safety Team.  The principles apply to many roads in Edinburgh.

Below I will lay out some of the considerations taken into account but the upshot for this location is twofold; previous analysis shows insufficient risk factors to justify prioritisation of substantial spend; further analysis will be undertaken with the possibility of some minor adjustments to the road layout.  Be warned, the explanation below gets quite technical.

1. Annual investigation all streets.  The Road Safety Team undertakes an annual collision investigation into all streets within the City of Edinburgh Council area. This investigation is carried out using the collision details supplied by Police Scotland, which is responsible for the collection of all personal injury road traffic collision data within its force area. From this analysis it is possible to determine locations where the collision rate is giving cause for concern and where road safety remedial works may require to be implemented. 
2. New collision data.  It usually takes several months for collision data to be recorded and verified. 
3. One injury incident - stolen vehicle.  In the latest available 10-year period for which data is currently available (to the end of September 2017) there was one personal injury collision reported to the Police on Peffermill Road, near the entrance to the Playing Fields. This involved a stolen vehicle striking a stationery vehicle and injuring the driver of the stationery vehicle, which was parked at the side of the road. The driver of the stolen vehicle then made off and later abandoned the vehicle. This collision resulted in a slight injury.  
4. Prioritisation.  Each year the Council receives a far greater number of requests for pedestrian crossings than we can build. To manage these requests, we have developed a priority system to evaluate locations and the crossing type most suitable for each location. The current priority system was approved by the Council’s Transport Infrastructure and Environment Committee on 28 July 2009. 
5. The calculation.  The base data which is used to assess if a location is suitable for a crossing is known as the PV2 value. This is a nationally recognised value that indicates the number of passing vehicles and crossing pedestrians. Pedestrian and vehicle counts are taken over the peak hours of a week day, from 7am to 10am and 3pm to 6pm, and avoiding any school holidays or other factors which may skew results.
 6. This base PV2 value is then adjusted to take account of local factors such as the age of those crossing, the composition of passing traffic, the number of pedestrian accidents and the number of trip attractors such as schools, doctors’ surgeries, shops etc.A location with an adjusted PV2 value of 1 or higher (2 or higher on a dual carriageway) would be considered for a puffin crossing, locations with a value of 0.3 or higher would be considered for a suite of measures that includes a zebra crossing, a refuge island or pavement build-outs. If a very low PV2 value is achieved no additional crossing facilities may be recommended.
7.  Low relative risk factor.  A crossing assessment was undertaken at this location in 2013, which resulted in an adjusted PV2 value of 0.47. This resulted in the construction of a new pedestrian refuge island to the east of the entrance to the Playing Fields, outside number 50 Peffermill Road. There is also another, older, refuge island to the west of the entrance outside number 45
8.  A  further crossing assessment will now be carried out, though current indications are it will not lead to substantial re-engineering.

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