Introduction

The Carriageway Statistics keep you informed about the traffic on the carriageway and it’s individual sections. They are available to view on the Carriageway Mini Control in the ClearWay™ user interface and can be provided to 3rd party systems through the connector plugins ICD-001, ICD-006 and ICD-007. In addition the statistics are recorded in the central data storage and can be queried to review the history of the traffic data.

The statistics are collected in real time. Each vehicle is analysed to work out its average speed and its approximate size, so it can be classified in terms of a large or small vehicle. With this data the system can report traffic counts and average speeds, based on vehicle types across the entire carriageway. The information is reported on a per section, per carriageway basis. This data can be passed on to external systems in real time but it is also recorded to the primary data store. This allows historical traffic conditions for any section to be analysed in detail over any period of time.

For details on how to analyse recorded statistics data please refer to Carriageway Queries.

Contents

Accessing the Carriageway Mini Control

Selecting a carriageway will open its mini control as highlighted in the example below:

Open

You can then drill down for more information within the mini control:

Open

Carriageway Mini Control

The Carriageway Mini Control will show you statistics for the carriageway, individual sections and the radar to section allocation.

Carriageway Statistics

This displays the carriageway statistics which have been gathered by the system as specified in the Statistic settings. Please refer to: Carriageways | Statistics for more information about this.

Sections

This displays the number of sections within the carriageway, which have been configured. Please refer to Adding Carriageways.

Avg Speed

This displays the current average speed of the tracks within the carriageway in metres per second.

Track Count

The number of tracks currently detected on the carriageway.

Empty

Whether the carriageway is empty or not at the current time. When a carriageway is detected and reported as empty, (as a result of the settings of the Quiescence Timer being satisfied; please refer to Carriageways | Statistics) the Empty flag will be shown in the Carriageway Stats for the selected section.

Current Coverage

This is the current coverage of all of the sections on the carriageway shown as a percentage and is colour coded; healthy (green) or unhealthy (red).

There are four elements which control coverage; Range of the Radar, Contour Maps, Exclusion Areas and Radar Group allocation to a carriageway. Please refer to Section Allocation and Coverage | Coverage for more information.

By hovering the mouse over the Current Coverage indicator, a tooltip will be displayed which shows:

Total: The total number of radars.

Impaired: The number of radars with impaired coverage.

No Coverage: The number of radars with no coverage.

Partial Coverage: This is the number of radars with partial coverage on the carriageway.

Section Statistics

This displays the following section statistics which have been configured. You can edit the properties of each carriageway section here: Carriageways | Section Settings.

Section Number

This is the selected section of the carriageway.

Direction

The direction of the tracks in that section, in degrees.

Queue State

This will show if there is a queue in that section, or not.

Travel Time

This is the average time that targets take to travel through the section, in seconds.

If there are no tracks in the section, this will show a travel time of 0 unless a Speed Limit has been configured which enables the system to calculate expected travel times along the carriageway or section. The speed can be set from the Carriageway Profile Editor. Please refer to this documentation for information Carriageway Profiles | Profile Editor.

Vehicle (s)

This is the average time that vehicles take to travel through the section.

Large Vehicle (s)

This is the average time that large vehicles take to travel through the section.

Current Coverage

This is the actual radar coverage for the section, pending a healthy radar connection.

Coverage Status Tooltip

By hovering the mouse over the Current Coverage indicator, a tooltip will be displayed, which reveals the Normal Coverage and Current Coverage in the Section details:

Normal Coverage: This is the expected radar coverage for the section.

Current Coverage: This is the actual radar coverage for the section, pending a healthy radar connection.

Coverage Status

This indicates if the coverage status is healthy (green) or unhealthy (red).

Statistics Status

This indicates if the statistics status is healthy (green) or unhealthy (red).

Track Count

A graph to display the track count in that section over time.

Average Speed

A graph to show the average speed of tracks in that section over time.

Sensor Allocation

This is a toggle to show/hide the sensors on the carriageway. Section Allocation is how we have allocated sections of a carriageway to a radar for the sole purpose of gathering traffic statistics. For more information regarding the section allocation and coverage, please visit: Section Allocation and Coverage.

Accessing Statistics Data Using Plugins

Plugins act as an interface between Witness and 3rd party systems. The three plugins discussed; ICD-001, ICD-006 and ICD-007 expose carriageway data, such as average speed of the traffic and radar health status. Each plugin adopts its own protocol or communication mechanism to support common standards or proprietary connections to external systems.

ICD-001

The ICD-001 Carriageway Statistics Report contains information across all of the highway road sections. This includes the name and ID of the carriageway, track count, average track speed, radar health, normal radar coverage (and if the radar coverage is impaired), the current radar coverage and the date and time of these statistics. This data is grouped by carriageway and then by section, as seen in the example below.

Example Carriageway Statistics Report

Please refer to ICD-001 Carriageway Statistics Report for further information regarding the report, and ICD-001 Plugin for more information about the ICD-001 Plugin.

ICD-006

The ICD-006 plugin enables Modbus protocol communication by creating a Modbus server on the management server machine. This provides traffic and alarms data for up to 2 carriageways with up to 500 sections and 8 lanes each, and health data for up to 445 radars.

You can see there are registers for section traffic speed and traffic count which would be for each of the two carriageways as in the example extracts below:

Radar Health information:

Please refer to ICD-006 Plugin for further insight regarding the ICD-006 Plugin.

ICD-007

The ICD-007 OPC Server integration plugin allows 3rd party OPC UA clients to connect and obtain radar health status and carriageway stats including section traffic speed and traffic count data.

This information is repeated for each carriageway section as in the example excerpts below:

Please view: ICD-007 Plugin for more information.

Related Information