Summary of Speed Indicator Device (SID) Activity
For the period 11th November 2021 to 9th January 2022
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Location : During this period the SID was positioned on the A354 (Salisbury Road), in the 40 mph speed limit zone. The SID was mounted on a fixed 40 mph repeater sign-post on the left side of the road as you leave the village heading towards Salisbury. This site is referred to as the Salisbury Road, Secondary site.
Details of average and maximum speeds, traffic volumes, percentage of drivers within the speed limit and 85th percentile speeds are in the Scribd document below. For the latest on Community Speed Watch
18th Jan 2022. Read Philip Wilkinson, PCC's response to comments made in the BBC One Panorama Programme aired on 17th Jan. by clicking on this link
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For more information regarding approved SID sites in Coombe Bissett and Homington villages please refer to the SID location Power Point guide.
The last time the SID was at this location, facing in the same direction, was between 18th January and 11th February 2021. Please refer to the report covering this period which you can find in the Salisbury Road tab. Average speeds are more or less the same as last year while the maximum speeds are still disappointingly high and will be referred to Wiltshire Police. The percentage of drivers travelling at less than 46 mph towards the sign has increased marginally by 2% and by 3-5% for outbound drivers. It is again pleasing to note that despite the SID being kept in the same location for just over 8 weeks it maintained a strong level of deterrence throughout the period; less than 8% of traffic entering the village was speeding. While there has been some improvement for traffic leaving the village, without the deterrent of the SID, 17-20% of drivers continue to exceed the speed limit.
Detailed PDF reports:
Please refer to the tab for Salisbury Road for 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).
Detailed PDF reports:
Please refer to the tab for Salisbury Road for 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).
Community Speed Watch (CSW) Update
The Coombe Bissett CSW team has resumed speed checks after the Christmas/New Year break. Simon Boxall (Parish Councillor) for Homington has joined the team. So far two recruits besides Simon have volunteered to form a new CSW team for Homington. The new members will initially be trained as part of the existing team. In the meantime, CSW HQ has been asked to advise the quickest way to re-activate the Homington CSW team.
Philip Wilkinson, Wiltshire’s Police and Crime Commissioner, continues to push for the improvement of Road Safety in Wiltshire. At present there is one traffic enforcement officer equipped with a fully automated speed gun which can process up to 10 speeding tickets an hour, who is part of the PCC’s team. Two more enforcement officers with additional speed guns are in the process of being deployed.
Rhys Schell of Wiltshire Council has been asked to assist in a survey to identify all communities in Wiltshire who have installed their own SIDs. It is intended to seek approval from respective Parish Councils for data collected by those devices to be shared with respective Community Police Teams across Wiltshire. By using this data together with data consolidated by CSW HQ it is hoped that locations where road safety is a critical issue can be more readily identified and Police support can be deployed accordingly.
Details of all the issues and follow up actions from the ZOOM meeting conducted by Philip Wilkinson and John Derryman with all CSW Team Leaders on 15th November 2021 continue to be available here.
Philip Wilkinson, Wiltshire’s Police and Crime Commissioner, continues to push for the improvement of Road Safety in Wiltshire. At present there is one traffic enforcement officer equipped with a fully automated speed gun which can process up to 10 speeding tickets an hour, who is part of the PCC’s team. Two more enforcement officers with additional speed guns are in the process of being deployed.
Rhys Schell of Wiltshire Council has been asked to assist in a survey to identify all communities in Wiltshire who have installed their own SIDs. It is intended to seek approval from respective Parish Councils for data collected by those devices to be shared with respective Community Police Teams across Wiltshire. By using this data together with data consolidated by CSW HQ it is hoped that locations where road safety is a critical issue can be more readily identified and Police support can be deployed accordingly.
Details of all the issues and follow up actions from the ZOOM meeting conducted by Philip Wilkinson and John Derryman with all CSW Team Leaders on 15th November 2021 continue to be available here.
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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