Introduction
This section covers Carriageways; specifically their shape and setting configuration.
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This process is discussed as in part of the Quick Setup here.Guide: Adding Carriageways
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Editing a Carriageway
As usual when configuring an Entity, go to the the Config tab, select the desired entity - in this case a carriageway - then select Edit to go into the edit mode. However, unlike some of the other shape, space and area related entities;Creating and Editing Entities, carriageways have certain specific configuration processes.
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Carriageway Configuration
The global settings and edits available for carriageways are explained here and :Carriageway Settings and on a User by User basis here basis here:Carriageway.
Carriageway settings available in the Configuration Panel once you have enabled Configuration Mode and selected the carriageway:
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Use Defaults: select this to use the Global Default Settings: Carriageway Settings. Otherwise you can apply your own carriageway specific options.
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Show Section Labels: Select this for labels to appear on this carriageway's sections (by default green and numerical).
Enable Queue Logic: Select to enable queue recognition software for this carriageway. Once implemented, queues will be be flagged and display visually through an orange fill in the detection area.
Maximum Speed for Queue: The maximum traffic speed for a queue to be recognised in this carriageway. Anything faster will not be defined as a queue.
Heavy Traffic Threshold: The speed at which traffic is considered heavy on this carriageway.
Slow Track Density for Queue (/100m): How many tracks, travelling slower than the maximum queue speed, over one hundred metres, are necessary to considered a section in queue in this carriageway. This calculation of traffic density, as well the average speed of the traffic measured against the maximum queue speed, combine to recognise and alert queues.
Reset Count Down (s): The time necessary to pass, after the queue rule has been broken, without the queue rule being broken again for the queue alert to be lifted in this carriageway.
Enable Auto Queue: Select this is you wish to implement Auto Queue for this carriageway. The software extrapolates on existing queue data to estimate potential or unrecognised queues.
Auto Queue Detection Window: How many of this carriageway's sections within every window the Auto Queue studies e.g. 4.
Auto Queue Section Count: How many of this carriageway's sections have to be in an existing queue in order for the Auto Queue to assume the entire window is in queue e.g. 2.
Sensor Allocation Mode:
Nearest: Detects data from this carriageway's sections assigned to them by proximity (by default).
All in Range: Detect data from all this carriageway's sections within their range, sometimes resulting in overlap and double-data.
Default Parameters: The parameters by which this carriageway will detect traffic. A sample selection of detection parameters, including a (default) Default configuration, is available. You are able to configure your own under Tracking Parameters. The default tracking parameters available are:
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Default Debris Parameters: The parameters by which this carriageway will detect debris. A sample selection of detection parameters, including a (default) Debris configuration, is available. You are able to configure your own under Tracking Parameters. The default debris detection parameters available are:
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Statistics Update Interval (s): The period of time between this carriageway's data updates, denoting how often an update occurs.
Statistics Storage Interval (s): The period of time between this carriageway's section data being transferred to the database, denoting how often a data transfer occurs. The data transferred is an aggregate of all the data collected within the time period of the Statistics Storage Interval.
Statistics Stale Timeout (s): The period of time in which no data is recorded from a particular section in this carriageway before it is ignored and not reported.
Statistics Minimum Seen (hits): The minimum number of times a vehicle must be seen before it is considered for section statistics. This provides a useful confidence level for each track, so that only longer lived tracks are counted and used to calculate average speeds.
Rule Update Interval (s): How often the radar checks for rules being broken in this carriageway.
Quiescence Timer (s): The period of time this carriageway must be detected and recorded as empty before it is officially reported as empty. Please see Carriageway Empty.
Carriageway Empty
When a carriageway is detected and reported as empty, (as a result of the settings of the Quiescence Timer being satisfied) the Empty flag will be shown in the Carriageway Stats for a selected section, as in the example below:
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Carriageway Traffic Analysis
Please see Traffic Analysis Plugin for more information: Traffic Analysis Plugin.
Actions
Actions are specific operations that can be carried out in relation to a carriageway. There are four Actions that can be initiated when a carriageway is selected whilst in Configuration Mode.
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Rules: Select to open the Rules window to configure the Rules for the selected carriageway. See the ClearWay™ Rules page for further detaildetails.
Profile: Select to open the Profile Editor window to configure the carriageway operating modes. See the Carriageway Profile pageProfiles for further detaildetails.
Export to Layer: Select to export the carriageway outline as a new area to the Situational Awareness layer. Although the SA layer is selected by default, this outline area can be edited after it has been created and the layer can be changed.
Create POIs: Select to open the Create or Import Points of Interest wizard. See the POI page Points of Interest for further details.
There are two Actions that can only be initiated by first selecting Edit, and then the required Action:
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Auto Section: Select to divide the carriageway into sections. See the Auto-Section page for further details.
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Adjust Virtual Area: Select to open the Adjust Virtual Area window, and change the size of the detection area offset. The offset is the net area distance between the virtual detection area and the carriageway perimeter, and will always be a positive value, as the virtual detection area is always marginally larger than the carriageway. This is to account for a number of discrepancies; e.g. a margin of carriageway potting error, or detection at junctions adjoining the carriageway etc.
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