United States Department of Transportation
i
DSL for traffic video
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1999-07-01
[PDF-281.83 KB]
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NTL Classification:NTL-INTELLIGENT TRANSPORTATION SYSTEMS-INTELLIGENT TRANSPORTATION SYSTEMS
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Abstract:Many traffic operations use “twisted pair” wiring, either owned by the public or leased from a local provider, to control field devices such as traffic signals or ramp meters. There are now commercially available communications technologies that can use this existing infrastructure to provide full motion traffic video in addition to the traditional field device control functions. These new technologies are called Digital Subscriber Lines (DSL). The FHWA recently concluded a successful demonstration of this concept within the cities of Alexandria and Fairfax, Virginia. Here, traffic video prototypes were deployed over existing traffic signal wiring using DSL equipment. Instead of re-cabling the city with fiber optic or other high-speed cable, this approach allows agencies to add video surveillance using their existing communications infrastructure and relatively inexpensive DSL equipment. Furthermore, these prototypes were installed and operational in one day.
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