Introduction
This section covers Carriageways; specifically their shape and setting configuration.
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This process is discussed in part of the Quick Setup Guide: Adding Carriageways and Single 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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When a Carriageway is selected, the Configuration Panel displays the Carriageway Settings.
Select Edit to enter the edit mode.
To add a lane, select the Add button:
A new lane tab will appear. Name the lane to label the lane tab and on thePPI.
Stipulate Reverse Direction to create a counter-flow traffic lane.
Select Save.
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Select the Carriageway, then select Edit to enter the edit mode.
The editing points will now be visible. Section points are pink. Find a section point directly adjacent to where you want to add a section.
Ctrl+Left Click on the section point. Another section point will appear to the right of the original point. Left Click+Drag this new section point to adjust the size of your new section.
Select Save.
To remove a section
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Hide: Select this to hide the carriageway (turn translucent).
Has ERAs: If this option is selected then the first lane will be reserved for drawing Emergency Refuge Areas.
Virtual Tracking Areas: Select to auto-create a tracking area based on the shape of this carriageway.
Virtual Debris Tracking Areas: Select to auto-create a debris tracking area based on the shape of this carriageway.
Show Virtual Areas: Clearing this option will hide the Virtual Tracking Area on the PPI Map. It is selected by default.
Groups Restrict Tracking: Select this option if you want the selected groups of radar to only track on this carriageway. This will prevent radars from tracking on other carriageways even if they have line of sight.
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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.
Queue Break Allowance: The value the rule break count must reach in order to implement the queue logic. In order to cause a break both maximum queue speed and track density must be satisfied.
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Queue Break Decrement: The step value the queue break count will decrease by when the rules are not broken.
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.
Count All Sightings: Select this option if you require all sightings to be used for statistics calculation regardless of the sensor allocation setting. This setting does not apply to Traffic Analysis.
Default Tracking 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 below.
Queue Colour: The colour of the sections when in queue.
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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 Auto-Section for further details.
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