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5.0 Toll Collection Equipment Technology

5.3.1 State-of-the-Practice

Of the various PTD display technologies used to convey messages to the user, the fol-lowing are three of the most common:

Based on the survey results, the LED displays have displaced the mainstay fluorescent flip disk as the most popular PTD technology. Since energy efficiency offered by LED and fluorescent flip disk are expected to be comparable, clarity of display, vendor prod-uct offerings, and maintenance considerations are likely the primary factors favoring the LED display.

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