Summary of Speed Indicator Device (SID) and Community Speed Watch (CSW) Activity
For the period 13th March to 15th June 2024
Blandford Road Primary SID Site
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Salisbury Road Secondary SID Site
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Location: The SID was positioned at the Blandford Road Primary site from 13th March to 10th May 2024. It was then moved to the Salisbury Road Secondary site from 16th May until 15th June 2024.
Please see the tables below for details of traffic speeds and volumes during this period.
Please see the tables below for details of traffic speeds and volumes during this period.
For the latest on Community Speed Watch
For more information regarding approved SID sites in Coombe Bissett and Homington villages please refer to the SID location Power Point guide.
Average speeds are effectively the same as the previous time the SID was at this location facing traffic coming from Blandford. The percentage of drivers travelling within Wiltshire Police tolerances for a 30 mph limit has improved. However, 85th Percentile speeds remain an issue and we continue to press the Community Speed Enforcement team to conduct some of their sessions at the approved CSW site at Wings Dairy.
The SID was rotated on 12th April to face traffic leaving the village. If we discount the maximum speeds recorded during the period, it is clear that the problem at this location is mostly with speeding drivers leaving Coombe Bissett. Once the speed sign is directed at them, average speeds reduce – and the percentage of drivers keeping within the speed tolerance improves dramatically. 85th Percentile speeds are also noticeably better. At the same time, the behaviour of drivers entering the village not just remains constant, it actually improves as well, without the benefit of the sign pointing at them.
Average speeds continue to be good at this location considering it is in a 40 mph limit, with a De-limit speed sign at the point of the village boundary. While the percentage of drivers who keep within Wiltshire Police speed tolerances is more than 95%, a small percentage of drivers continue to speed excessively, regardless of the speed sign. We requested a follow-up Road Traffic Survey after the results of the one conducted last year showed anomalies in the data. The results of latest report which was for the week commencing 15 April 2024, are frustrating:
85th Percentile Speeds
East Bound (leaving the village in the direction of Salisbury) 46.2 mph
West Bound (Entering from Salisbury) 43.8 mph
Combined 45.2 mph
Wiltshire Highways maintain that traffic speeds in both directions have to be combined and averaged. Only if the average speed of traffic in both directions exceeds the tolerance set by NPCC guidelines can further action be taken. In this instance, combined speeds have to exceed 46.1 mph. Consequently, we are not able to seek approval to use this location to conduct CSW sessions.
85th Percentile Speeds
East Bound (leaving the village in the direction of Salisbury) 46.2 mph
West Bound (Entering from Salisbury) 43.8 mph
Combined 45.2 mph
Wiltshire Highways maintain that traffic speeds in both directions have to be combined and averaged. Only if the average speed of traffic in both directions exceeds the tolerance set by NPCC guidelines can further action be taken. In this instance, combined speeds have to exceed 46.1 mph. Consequently, we are not able to seek approval to use this location to conduct CSW sessions.
Detailed PDF reports:
Please refer to the tabs for Blandford Road and Salisbury Road for a more detailed analysis of traffic data recorded by the SID, which is presented in PDF report format. Guidance Notes to each section of the PDF reports are provided below this summary.
Note: Our SID does not have GPS and therefore its reports are location agnostic. References in reports to Incoming and Outgoing traffic refer to traffic coming towards the device (Incoming) and traffic going past the device in the opposite direction (Outgoing).
Please refer to the tabs for Blandford Road and Salisbury Road for a more detailed analysis of traffic data recorded by the SID, which is presented in PDF report format. Guidance Notes to each section of the PDF reports are provided below this summary.
Note: Our SID does not have GPS and therefore its reports are location agnostic. References in reports to Incoming and Outgoing traffic refer to traffic coming towards the device (Incoming) and traffic going past the device in the opposite direction (Outgoing).
Wiltshire Speed Indicator Device Data Sharing
SID Data Sharing has been rolled out across Wiltshire for more than a year. There are over 100 SIDs installed in towns and parishes across Wiltshire. Communities who have purchased Evolis, MessageMaker, Pandora Technologies or Westcotec devices are able to share their data with Wiltshire Police who use the information to prioritise the deployment of Wiltshire Police’s Speed Enforcement resources.
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Community Speed Enforcement Officer (CSEO) Team
The CSEO team have been conducting roadside speed enforcement sessions in Coombe Bissett, using the CSW Deegan House location. Debbi Hide of the CSEO team advises she has carried out speed checks at 9:30 to 10:30 am; 12 pm to 1 pm and 2 pm to 3 pm. A summary of CSEO reports is as follows: |
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Community Speed Watch (CSW) Update
Lights! Camera! Action!! We were asked by Alan Aldersley-Byrne, Community Engagement Officer for Wiltshire Police to take part in a video which was going to be used to promote CSW activity during Wiltshire Police’s Volunteers Week this year. Gill and Chris Humphreys and Simon Boxall took part in a quickly scheduled Speed Watch session, which also involved our local Community PC Mark Evans. Well done Gill and Chris for inviting Mark at such short notice!
youtube.com/watch?v=UKFMlC8sf8g&feature=shared
youtube.com/watch?v=UKFMlC8sf8g&feature=shared
A total of 26 Speed Watch sessions were conducted between 6th March and 12th June 2024
As the weather has improved our average number of weekly sessions has increased from 1.5 per week to 1.9 sessions per week. This compares to 2.4 sessions per week approximately this time last year. We will struggle to get back to our previous frequency as the number of team members covering Deegan House and Tottens Farm has now halved. Unfortunately, Water Lane no longer has any regular, active team members either. It is, therefore, pleasing to note the Homington team’s diligence. The number of sessions they completed in the current period (12) is more than double their efforts this time last year.
Meanwhile, the work of the Community Speed Enforcement Team at Deegan House (reported in the section above) continues to be a major contributor to the reduction in the number of speeders we report at that location (39% reduction compared to June-July 2021). We will continue to press the CSEO team to conduct sessions at our other CSW sites in the expectation that that will reduce speeding drivers at those locations as well.
All in all, we believe the Police and Crime Commissioner’s Speed Enforcement team and Wiltshire Police are making great strides to reduce speeding and improve road safety across Wiltshire.
More information on the work being done by Wiltshire Police and the Police and Crime Commissioner and his team is available on the PCC’s website. Please use the following Link
www.wiltshire-pcc.gov.uk/about-us/campaigns/road-safety/#
Meanwhile, the work of the Community Speed Enforcement Team at Deegan House (reported in the section above) continues to be a major contributor to the reduction in the number of speeders we report at that location (39% reduction compared to June-July 2021). We will continue to press the CSEO team to conduct sessions at our other CSW sites in the expectation that that will reduce speeding drivers at those locations as well.
All in all, we believe the Police and Crime Commissioner’s Speed Enforcement team and Wiltshire Police are making great strides to reduce speeding and improve road safety across Wiltshire.
More information on the work being done by Wiltshire Police and the Police and Crime Commissioner and his team is available on the PCC’s website. Please use the following Link
www.wiltshire-pcc.gov.uk/about-us/campaigns/road-safety/#
We try and make sure we cover as much of the community as possible. As you can see, we have been unable to run CSW sessions in some sites and the number of sessions at other locations has fallen due to a lack of volunteers. If you would like to become part of the Community Speed Watch team and help us in our efforts to improve road safety in the parish, please don’t hesitate to call Adrian Turnbull on 07747 620210 or email me at [email protected] .
Thank You!
Thank You!
NOTE EXPLAINING INFORMATION IN PDF REPORTS
OF SPEED INDICATOR DEVICE (SID) ACTIVITY
COVER PAGE
The start and end dates for the period the device has been active at a location are shown on all pages.
Location: Records where the SID device was positioned during the report period and is shown on all pages.
Note: The Parish Council agreed that the SID should serve as much of the community as possible. Sites have had to be agreed by Wiltshire Council. At present there are a total of 7 approved sites. Details of exactly where each site is located are available in a separate document.
Comments: Details here show the speed limit for the site where the SID was located and the direction of traffic the SID was monitoring at that location:
- Inbound relates to traffic coming into the village
- Outbound relates to traffic leaving the village
The Comments section also states whether the sign was actively displaying the speed information to oncoming traffic or if it was in ‘Spy Mode’. Spy Mode records traffic information but does not display speeds, and is used to baseline traffic speeds at the start of the period.
PAGE TWO: AVERAGE SPEEDS
The Average Speeds graph includes two averages:
- An ‘average by time period’, which is displayed as a curve on the graph. (one curve per direction: ingoing/outgoing).
- An overall average which is displayed as a numeric value just below the graph.
The ‘average by time period’ corresponds to the arithmetic average calculated on the speeds recorded between the start/end dates. They are presented on a default time period of 30 minutes. The overall average corresponds to the arithmetic average of all the speeds included between the starting/ending dates on the time period selected for the PDF report. The software sums up all of the recorded speeds, then divides the result by the number of vehicles measured.
Note: References in the PDF report to Incoming direction and Outgoing direction relate to the direction of traffic in relation to the SID. ‘Incoming’ relates to traffic heading towards the device. ‘Outgoing’ relates to traffic going past the device in the opposite direction
PAGE THREE: MAXIMUM SPEEDS
Similar to the information for average speeds, the graphs relating to maximum speeds are displayed in curve and number format.
- The maximum speed recorded per time period are displayed in graph form (oncoming and outgoing are reflected in different colours).
- The maximum speed recorded over the entire time period is shown for each direction as a numeric value just below the graph.
PAGE FOUR: VEHICLES PER HOUR
Graphs show traffic volumes for incoming traffic (Green) and outgoing traffic (Blue) for each 24-hour period covered by the report. Total volumes are shown at the top right of the graph
PAGE FIVE: SPEED DISTRIBUTION FOR INCOMING TRAFFIC
PAGE SIX: SPEED DISTRIBUTION FOR OUTGOING TRAFFIC
In these sections, the recorded speeds are represented in pie chart form, and allow you to see the percentage of vehicles which have, or have not, observed the speed limit.
The first segment shows the percentage of vehicles which are travelling below or at the legal speed limit in that location. The second segment shows the percentage of vehicles which are travelling above the legal limit but approximately within the speed tolerances permitted by Wiltshire Police and Community Speed Watch before drivers may be sanctioned. The remaining segments show the percentage of vehicles travelling at excessive speeds.
PAGE SEVEN: PERCENTILES FOR INCOMING TRAFFIC
PAGE EIGHT: PERCENTILES FOR OUTGOING TRAFFIC
The 85th percentile is an indicator that helps illustrate the behaviour of the majority of drivers. It reflects the speed respected by 85% of motorists and is obtained by stripping out the bottom and top & bottom 7.5% of speeds recorded (i.e. strips out the extremely fast and extremely slow vehicles).
If the 85% threshold is close to the average speed recorded, this indicates that the speeds observed on a road are consistent. If it is not close to the average speed, this means that a significant proportion of drivers are above the average recorded speed.
Note: Wiltshire Police use 85th Percentile speeds to determine whether they should conduct their own Speed Checks in any location. This is normally determined by the use of a Traffic Speed Survey which is sometimes referred to as a Metro Count. It involves two rubber strips placed across the road connected to a recording device. To-date, the Parish Council have had to request Speed Traffic Survey reports on a case by case basis, before any Police enforcement action will be considered.
The start and end dates for the period the device has been active at a location are shown on all pages.
Location: Records where the SID device was positioned during the report period and is shown on all pages.
Note: The Parish Council agreed that the SID should serve as much of the community as possible. Sites have had to be agreed by Wiltshire Council. At present there are a total of 7 approved sites. Details of exactly where each site is located are available in a separate document.
Comments: Details here show the speed limit for the site where the SID was located and the direction of traffic the SID was monitoring at that location:
- Inbound relates to traffic coming into the village
- Outbound relates to traffic leaving the village
The Comments section also states whether the sign was actively displaying the speed information to oncoming traffic or if it was in ‘Spy Mode’. Spy Mode records traffic information but does not display speeds, and is used to baseline traffic speeds at the start of the period.
PAGE TWO: AVERAGE SPEEDS
The Average Speeds graph includes two averages:
- An ‘average by time period’, which is displayed as a curve on the graph. (one curve per direction: ingoing/outgoing).
- An overall average which is displayed as a numeric value just below the graph.
The ‘average by time period’ corresponds to the arithmetic average calculated on the speeds recorded between the start/end dates. They are presented on a default time period of 30 minutes. The overall average corresponds to the arithmetic average of all the speeds included between the starting/ending dates on the time period selected for the PDF report. The software sums up all of the recorded speeds, then divides the result by the number of vehicles measured.
Note: References in the PDF report to Incoming direction and Outgoing direction relate to the direction of traffic in relation to the SID. ‘Incoming’ relates to traffic heading towards the device. ‘Outgoing’ relates to traffic going past the device in the opposite direction
PAGE THREE: MAXIMUM SPEEDS
Similar to the information for average speeds, the graphs relating to maximum speeds are displayed in curve and number format.
- The maximum speed recorded per time period are displayed in graph form (oncoming and outgoing are reflected in different colours).
- The maximum speed recorded over the entire time period is shown for each direction as a numeric value just below the graph.
PAGE FOUR: VEHICLES PER HOUR
Graphs show traffic volumes for incoming traffic (Green) and outgoing traffic (Blue) for each 24-hour period covered by the report. Total volumes are shown at the top right of the graph
PAGE FIVE: SPEED DISTRIBUTION FOR INCOMING TRAFFIC
PAGE SIX: SPEED DISTRIBUTION FOR OUTGOING TRAFFIC
In these sections, the recorded speeds are represented in pie chart form, and allow you to see the percentage of vehicles which have, or have not, observed the speed limit.
The first segment shows the percentage of vehicles which are travelling below or at the legal speed limit in that location. The second segment shows the percentage of vehicles which are travelling above the legal limit but approximately within the speed tolerances permitted by Wiltshire Police and Community Speed Watch before drivers may be sanctioned. The remaining segments show the percentage of vehicles travelling at excessive speeds.
PAGE SEVEN: PERCENTILES FOR INCOMING TRAFFIC
PAGE EIGHT: PERCENTILES FOR OUTGOING TRAFFIC
The 85th percentile is an indicator that helps illustrate the behaviour of the majority of drivers. It reflects the speed respected by 85% of motorists and is obtained by stripping out the bottom and top & bottom 7.5% of speeds recorded (i.e. strips out the extremely fast and extremely slow vehicles).
If the 85% threshold is close to the average speed recorded, this indicates that the speeds observed on a road are consistent. If it is not close to the average speed, this means that a significant proportion of drivers are above the average recorded speed.
Note: Wiltshire Police use 85th Percentile speeds to determine whether they should conduct their own Speed Checks in any location. This is normally determined by the use of a Traffic Speed Survey which is sometimes referred to as a Metro Count. It involves two rubber strips placed across the road connected to a recording device. To-date, the Parish Council have had to request Speed Traffic Survey reports on a case by case basis, before any Police enforcement action will be considered.
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