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Introduction

This section explains Rules: their purpose, the default choices and configuration.

Overview

Rules form the core intelligence of the system, permitting automatic decisions to be made based upon observed behaviour in the field. One of the great strengths of the ClearWay™ application is its ability to assist the operator by making decisions in response to sensed target movements. As a result, a continual watch can be placed upon all areas of interest, with the operator being alerted (or other actions initiated) only when particular criteria are met. The key factor in enabling such intelligent automated behaviour is the use of rules.

Rules consist of basic conditions, such as:

‘If a target enters this area then sound an alarm’

OR

‘If a target is moving faster than 4 meters per second then follow it with a camera’.

Within ClearWay™ you can also combine two or more rules to apply very specific controls to particular regions. In addition to a set of adjustable default rules, you can also create any number of new rules using logical operators and other properties to achieve almost any desired outcome.

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Carriageway Wizard Rules

When Adding a Carriageway, the Carriageway Wizard offers the opportunity to create the carriageway complete with a selection of default rules (see Configure Rules).

The first page of the wizard requires the default rules to be selected if required:
The second page of the wizard allows each default rule to be individually configured. Rule conditions form the core of each rule. The automated decision to take or not take action is determined using the properties that are combined here, and later in the Configure Rules window. Determine the choice of properties through decided what behaviour to isolate and which rule will achieve this.

Configure Rules

There are 6 default rules:

Each is configurable, and has the ability to be switched on and off, or deleted. To configure the rules:

Under the Config tab, select the Carriageway in the Entity Tree.
In the configuration panel, select the ☰ options button next to Actions.
Select Rules, and a Configure Rules window will appear.

Creating a Rule

To create a new rule:

In the Configure Rules window, select New.
Select Rule Type:
1. Speed Rule
2. Queue Rule
3. Classification Rule
4. Reversing Rule
5. Track Speed Rule
Select Save. The new rule is now configurable as above.

Testing a Rule

Rules must be available to be tested to ensure that the correct alarms will be triggered when a rule is broken. In the Configure Rules window, there is a function for this exact task.

Select the rule you wish to test. Then, select Test.
The Rule Test window will appear. Choose the Section and Lane you wish the alarm to be tested in, then select OK.
On returning to the PPI Display, the alarm notifications will be visible (and if enabled, audible.)