Summary of Speed Indicator Device (SID) Activity
For the period 5th July to 2nd August 2022
|
Location: During this period the SID was positioned in Coombe Bissett, on the Stratford Tony Road, in a 40 mph speed limit zone. The SID was mounted on a moveable post on the left side of the road entering the village from Stratford Tony. This site is referred to as the Stratford Tony Primary site.
Please see the Scribd document 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.
The last time the SID was at this location, facing traffic entering the village, was between 24th June and 21st July 2021. It is pleasing to note that speeds have remained more or less the same as the last session at this site. For example, the percentage of drivers keeping to the 40 mph speed limit is 98.64% approaching the sign. While this represents a 0.36% reduction compared to last year, traffic in this area is still amongst the best behaved of all locations monitored. It is also noted that traffic volumes have increased 62-64% since last year. This seems to reflect more than just a return to pre-pandemic driving patterns. It is likely that more people are using this route than previously recorded.
Detailed PDF reports:
Please refer to the tab for Blandford 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 Blandford 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).
Wiltshire Speed Indicator Device Survey and SID Data Sharing Pilot
Work continues to share SID data with Wiltshire Police. Adrian Turnbull has now drafted a Terms of Reference document which summarises the scope and expected deliverables of the Pilot. A draft copy of the TOR is available here.
As you will note, besides Evolis Speed Indicator Devices, the Pilot will attempt to gather data from AutoSpeedeWatch systems, Pandora Technologies and MessageMaker SIDS.
Rodger Fooks of CSW HQ, Trowbridge has proposed that it should be possible to load csv files containing SID data directly into Wiltshire Police’s ‘ClickSense’ database by emulating the CSW Speed Return spreadsheet. Rodger has said if he is successful, he will adapt the CSW Speed Return spreadsheet and provide a SID Data variant.
File Header Information
The following information will need to be loaded into the spreadsheet each time a file of SID data is submitted. This information will be input into a ‘Header’ tab (similar to the Watch Info tab on current CSW speed returns):
Work continues to share SID data with Wiltshire Police. Adrian Turnbull has now drafted a Terms of Reference document which summarises the scope and expected deliverables of the Pilot. A draft copy of the TOR is available here.
As you will note, besides Evolis Speed Indicator Devices, the Pilot will attempt to gather data from AutoSpeedeWatch systems, Pandora Technologies and MessageMaker SIDS.
Rodger Fooks of CSW HQ, Trowbridge has proposed that it should be possible to load csv files containing SID data directly into Wiltshire Police’s ‘ClickSense’ database by emulating the CSW Speed Return spreadsheet. Rodger has said if he is successful, he will adapt the CSW Speed Return spreadsheet and provide a SID Data variant.
File Header Information
The following information will need to be loaded into the spreadsheet each time a file of SID data is submitted. This information will be input into a ‘Header’ tab (similar to the Watch Info tab on current CSW speed returns):
- Location (Town / Village / City)
- What3Words address of SID location
- Speed Limit
- SID Type
- [Date]
Detailed Report (CSV file)
It is proposed that the following information will be loaded from CSV files generated by our SIDs/ASW devices
*Evolis SIDs can record vehicle data for vehicles travelling towards and away from the SID. ASW, Pandora and MessageMaker devices all record data in one direction (towards the SIDs/away from the ASW device).
Pilot activity has involved pilot members identifying the what3words addresses of their SID sites and ensuring they are all able to extract csv files containing their SID data.
It is proposed that the following information will be loaded from CSV files generated by our SIDs/ASW devices
- Date
- Time
- Direction (Inbound / Outbound)*
- Number of measurements / vehicles
- Average speed
- Maximum speed
*Evolis SIDs can record vehicle data for vehicles travelling towards and away from the SID. ASW, Pandora and MessageMaker devices all record data in one direction (towards the SIDs/away from the ASW device).
Pilot activity has involved pilot members identifying the what3words addresses of their SID sites and ensuring they are all able to extract csv files containing their SID data.
Community Speed Watch (CSW) Update
A total of 11 speed watch sessions were conducted during the 4-week period under review:
My sincere thanks to all of the team for their ongoing commitment. It is pleasing to note that Homington residents have responded to Simon Boxall’s efforts to restart the Homington CSW team. Besides Simon, we now have 3 regular team members from Homington, which has resulted in a noticeable uptick in the number of CSW sessions conducted there. Well done, Simon!
You can see how Coombe Bissett and Homington CSW’s team compares with the other CSW 96 teams across Wiltshire. Please take a look at Data prepared by CSW HQ covering CSW activity over the past 2 years which is attached here.
You can see how Coombe Bissett and Homington CSW’s team compares with the other CSW 96 teams across Wiltshire. Please take a look at Data prepared by CSW HQ covering CSW activity over the past 2 years which is attached here.
| csw_opccdata_14072022_for_cbh.xlsx |
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.
| coombe_bissett_and_homington_sid_location_-_website.pdf |