Introduction
This section covers Carriageways; specifically their shape and setting configuration.
...
Introduction
This section covers Carriageways; specifically their shape and setting configuration.
The carriageway functions as a virtual replica of the monitored highway. It is necessary to have a virtual carriageway in order to accurately detect, analyse and report incidents observed by the radar. The virtual carriageway creates parameters around the actual detection area. The ClearWay™ program cannot function without at least one carriageway.
...
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 : 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 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.
...
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:
Default - Default tracking parameters.
Debris - Debris / stopped vehicle detection parameters.
Partial - Tracking parameters used where you need to track existing targets but do not want to create new tracks.
Default Debris Parameters: The parameters by which this carriageway will detect trafficdebris. A sample selection of detection parameters, including a (default) Default Debris configuration, is available. You You are able to configure your own under Tracking Parameters. The default tracking debris detection parameters available are:
Default - Default tracking Tracking parameters.
Debris - Debris Default debris / stopped vehicle detection parameters.
Partial - Tracking parameters used where you need to track existing targets but do not want to create new tracks.
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:
Default - Tracking parameters.
Debris - Default debris / stopped vehicle detection parameters.
Partial - Tracking parameters used where you need to track existing targets but do not want to create new tracks.
| Info |
|---|
Although you can select debris detection parameters for tracking (Default Parameters) and vice versa this is not recommended. |
You can create custom debris and custom tracking parameters to suit your own environment or can change the default tracking parameters. We would always recommend you copy the default settings and change these, rather than change the original default settings.
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.
| Info |
|---|
Although you can select debris detection parameters for tracking (Default Parameters) and vice versa this is not recommended. |
You can create custom debris and custom tracking parameters to suit your own environment or can change the default tracking parameters. We would always recommend you copy the default settings and change these, rather than change the original default settings.
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.
Carriageway Empty
When a carriageway is detected and reported as empty, the Empty flag will be shown as in the example below:
...
The Empty Carriageway status can also be queried via a Highways Log Query within Playback:
...
This will display results such as in the example below:
...
| Info |
|---|
The “Carriageway Empty” status can only be set to true if all the radars that are associated with the carriageway are reporting good health. |
Carriageway Traffic Analysis
...
There are two Actions that can only be initiated by first selecting Edit, and then the required Action:
...
Auto Section: Select to divide the carriageway into sections. See the Auto-Section page for further details.
...