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Introduction

This page discusses the purposes of Alarm Areas.

Overview

An Alarm Area is linked to a rule; usually one that triggers an alarm, and essentially limits the rule to be applied within the boundaries of the Alarm Area.

Because of the different Rule functions in ClearWay™ and AdvanceGuard®, the Alarm Area is configured differently for each programme.

On this page:

ClearWay™

In ClearWay™, an Alarm Area is used to limit a rule to a specific area. The rule doesn't technically need to have an alarm action to be limited to an Alarm Area, though the primary purpose of rules are to alert a user to irregularities, and an alarm is an efficient action to this effect.

To place a rule within an Alarm Area:

  1. Create an Alarm Area in the Create a New Area wizard, by selecting Alarm from the dropdown list of Area types, then selecting Finish.

  2. Select your Carriageway, then select Rules from the Actions ☰ dropdown. The Rules window will open.

  3. Create a New Rule or select an existing Rule.

  4. In the Rule configuration options, select the Area tab.

  5. A list of available Alarm Areas will be tabled. To assign a rule, select Edit and then select the Enable box beside the desired Alarm Area. Select Save to confirm.

The secondary purpose of an Alarm Area is to allow alarms, or other actions triggered by rule breaks, to be carried out in lanes or sections of the carriageway where they are being suppressed. By default, all alarms are suppressed for sections which are in queue. Therefore, Ignore Queues can be selected (per lane) to enable alarms during queuing in the selected lanes. However, if you wish to Ignore Queues in only specific sections, not an entire lane, then Alarm Areas can be placed over the desired sections.


AdvanceGuard®

In AdvanceGuard®, a Security Rule can include an Area Check. The areas used for an Area Check should be Alarm Areas, as an Area Check is essentially equivalent to limiting the rule to an area, as above.

Alarm Areas can also be used to suppress alarms in particular areas. An Alarm Exclusion Area can be created through a Track Query:

  1. Perform a Track Query, in the Playback tab, and select Show on the track results in the Query Results Panel.

  2. Identify potential areas of repeated debris or unclassified tracks, then select and Locate a specific track. Selected tracks will highlight individual sightings on the PPI when selected.

  3. Select Create Exclusion to insert an Alarm Exclusion Area around the track's Area Covered. The area below is outlined in orange.

  4. The new Alarm Exclusion Area will appear in the Configuration Tree under the Areas folder, and can be enabled or disabled by toggling Armed/Disarmed in the Area Details Panel.

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