CHAPTER 7 CHANNELS-ALERTS-ZONES 71
Figure 7.7 – Providing Dilemma Zone Protection
By providing zones for level-one priority dilemma zone protection, level-two dilemma
zone protection and queue clearance, a priority channel provides exceptional detection
from start-of-green to end-of-green.
Note
There may be a number of uses of the discovery range feature for other applications
than truck priority. For example, you could require that a vehicle be discovered at a
certain range (using the discovery range threshold) and that it travels to a down-
stream zone several hundred feet away before it activates a channel output. This is
a way to know that we have tracked a specific vehicle over an extended range. This is
better than simple using the channel delay because it isolates a single vehicle.
Normal Channel
Normal channels consist of (see Figure 7.8):
8 channels
4 alerts per channel (32 total)
4 zones per alert (128 total)
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