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T400 Controller Facilities Manual

667/EB/20200/000 Page 2-1 Issue 9

2. STAGES

2.1 FACILITIES

There are up to 16 stages (0 to 15) available for use.

Stage 0 is normally used as a manual all-red facility. It may be used as a traffic stage.

Stage 1 normally is the start-up stage and must not be deleted.

Some stages may appear in some modes but not others. However, it may be possible to

be in a stage not in the current mode if a change of mode occurs. If this happens then

the stage will respond to current stage change conditions after all minimum greens for

the phases in the stage have timed off.

2.2 ALLOCATION OF PHASES

The available phases are allocated to the stages in any combination subject to the

method of control, the traffic requirements and safety considerations. Figure 21.2 and

Figure 21.5 illustrate an example of allocating phases to stages.

2.3 STAGES ACTIVE

A stage is considered active when all fixed phases (see Sections 3.7.1 & 3.8) that are

allocated to the stage are at green and all phases (fixed or non-fixed) that are not

allocated to the stage are at red.

A stage is considered to be terminating when:

The first phase which has had ROW (i.e. been at green) during the stage, loses right of

way.

2.4 INTERSTAGE PERIOD

The interstage period is the time between one stage terminating and another stage

becoming active.

2.5 STAGE CHANGE ALGORITHM

In all modes the controller monitors the following all demands (for both phases and

stages), extensions and maximum green timers every 200ms. These are monitored in

order to check to see if it is possible to move to a new stage, and serve new demands.

In order to select the next stage (SUGGESTED STAGE) the controller goes through

the following decision-making process.

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