Traffic Reports - Padbury Parish Council

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The Parish Council has three speed indication devices which are placed around the village. Although all can be moved to different pre-approved positions they are currently located as follows:

· On the A413 near Springfields, recording speed as vehicles enter and leave the village in the direction of Winslow.

· On the A413 near Church Lane, recording speed as vehicles enter and leave the village in the direction of Buckingham.

· On Main Street near Amblers Way, recording speed as vehicles enter and leave the village in the direction of Steeple Claydon.

Below are the latest reports from the devices and there are some notes to assist in understanding the reports produced from the speed indication devices.

These reports are produced by specialised software and may not be accessible to users of assistive technologies.

Guidance on reading the reports

As a vehicle approaches the speed device, its speed is recorded, at approximately 100 metres (dependent on how flat and straight the road is) from the device. This is shown on the charts/graphs as ‘oncoming’.

The speed of the vehicle is recorded again as it passes the device and this is the ‘velocity of exit’.

Using this information it is possible to measure the change in speed as vehicles approach and pass the device.

For a vehicle leaving the village a single recording is made, as the vehicle passes the device, and this is the ‘outgoing’ speed.

These three terms appear on the reports.

There is a fourth term ‘cross-section’ which is a combination of the vehicles entering the village when first detected and when leaving the village and so gives an idication of the total number of vehicles on the roads.

At the top of each chart/graph is information about the period covered by the report etc. Some of the charts/graphs are self-explanatory.

DSD safety success

This shows the average speed of vehicles entering the village, at the point of initial detection and as the vehicles pass the device. A reduction between ‘Vin’ and ‘Vout’ indicates that, on average, vehicles are slowing down.

Speed figures

Gives various measures for the speed of vehicles entering (oncoming) and leaving (outgoing) with a ‘cross-section’ of all vehicles.

Speed classes – incoming

Gives a breakdown of the number of vehicles entering the village at different times of the day and at different speeds.

Speed classes – outgoing

Gives a breakdown of the number of vehicles leaving the village at different times of the day and at different speeds.

Time variation curve

This is a graph of the number of vehicles oncoming into the village (green), outgoing (red) from the village and a combination (blue) at different times of the day.

Speed diagram – direction oncoming

This is a graph of the speed of vehicles oncoming into the village at different times of the day. Minimal inlet velocity (blue) is the lowest speed recorded, maximal inlet velocity (red) is the highest speed and average inlet velocity (green) is the average speed.

Speed diagram – direction outgoing

This is the same as the above diagram, but is the speed of vehicles leaving the village.

Speed histogram

This shows, for different speed bands:

· Oncoming (green) is the number of vehicles when first detected entering the village.

· Velocity of exit (grey) is the number of vehicles entering the village at the point they pass the device.

· The outgoing (red) is the number of vehicles leaving the village at the point they pass the device.

· Cross-section (blue) is the total of vehicles entering and leaving the village.

If the numbers shown on this report are devided by the numbers of days in the reporting period this gives an average daily vehicle count.

Generally, for the 30mph block, the velocity of exit (grey) is a larger number than the oncoming (green). This means that more cars are keeping to the speed limit at the point they pass the device than when first detected. So cars are slowing down.

For the other speed blocks the picture reverses. The velocity of exit (grey) total is less than the oncoming (green) total. So at the point of passing the device there were less cars exceeding the speed limit than at the point of first detection.