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This section explains the ClearWay ClearWay™ Rules, their purpose and configuration.
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Carriageway Wizard Rules
When Adding a Carriageway, adding a carriageway: Adding Carriageways the Carriageway Wizard offers the opportunity to create the carriageway complete with a selection of default rules. The default rules created are:
Person Rule
Slow Vehicle Rule
Reversing Vehicle Rule
Queue Rule
Debris Rule
Stopped Vehicle Rule
Wizard Configuration
You can select which of these rules is created and you can also change the key settings as part of the wizard process.
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To manually create a new rule without using the wizard:1.
In the Configure Rules window, select New.
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Select Rule Type:
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Speed Rule
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: Section speed rules look for one or more vehicles moving slowly in a section.
Queue Rule
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: Queue rules alarm when a section has gone into queue.
Classification Rule
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: Section classification rules look for one or more vehicles with the specified classification, can include other filters such as speed etc.
Reversing Rule
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: Section speed rule but designed specifically to look for vehicles going in the wrong direction at a specified speed.
Track Speed Rule
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: Track speed rules are used to analyse each track in turn. Like all other rules, this will raise an alarm for a section, but the rule will look at each track individually to identify if it has broken the rule.
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Close Following Rule: This looks for when a vehicle is travelling too closely behind another vehicle. Like all other rules, this will raise an alarm for a section, but the rule will look at each track individually to identify if it has broken the rule.
Select Create Rule. The new rule is now configurable as above.
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| Info |
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Speed, Queue, Classification and Reversing Rules are Section Rules. This means that, by default, each section is examined at regular intervals for evidence of of one or more tracks breaking the rule. A Track Speed Rule is a Track Ruleand Close Following Rules are Track Rules. This means that each track is individually examined as to whether it is breaking the rule. Speed Rules and Track Speed Rules are different. A Speed Rule checks multiple tracks in each section over time against speed parameters; i.e. looking for common behaviour in traffic, whereas a Track Speed Rule checks individual tracks against speed parameters. For an individual track to trigger an alarm we must be satisfied that the track is real and the rule is definitely broken, so a high break count is set. Therefore, a Track Speed Rule is more suited to a Stopped Vehicle Rule where we are looking at the behaviour of individual tracks. |
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Testing a Rule
Rules can easily be tested to ensure that the correct alarms is triggered when a rule is broken. In the Configure Rules window, you can generate a test alarm from any of the existing rules.1.
Select the rule you wish to test. Then, select Test.
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The Rule Test window will appear. Choose the length of the delay, the Start Section, End Section and Lane you wish the alarm to be tested in, then select OK.
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This will automatically generate an alarm for each section that you have chosen in turn, with a pause of the specified delay time between each alarm. By default the delay is 1 second.
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4. Select OK when you are ready to start each section.The alarm notifications will be visible (and if enabled, audible) and the relevant section will change colour to reflect the alarm severity, assuming this option was selected in the rule configuration.
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Video
The following video shows the creation of a new classification rule, testing it using the Test option, and then using a Playback Track to simulate the rule being broken:
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