United States Department of Transportation
i
Innovative methods for calculation of freeway travel time using limited data : executive summary report.
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2008-08-01
[PDF-188.93 KB]
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Edition:Executive summary report
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Abstract:ODOT’s policy for Dynamic Message Sign
utilization requires travel time(s) to be displayed as
a default message. The current method of
calculating travel time involves a workstation
operator estimating the travel time based upon
observation of high-density vehicle detectors.
With the proliferation of cell phone usage and the
advent of computer-aided dispatch links from 911
call centers, incident detection no longer requires a
high density of vehicle detectors along the highway.
Therefore, ODOT’s future freeway management
system deployments (Cleveland, Akron-Canton,
Dayton-Springfield, and Toledo) will only have a
limited set of vehicle detectors for data sampling.
ODOT currently utilizes two different algorithms to
estimate travel time in its Freeway Management
Systems for display on Dynamic Message Signs.
These methods may no longer be accurate with
limited vehicle detector data. Therefore, innovative
methods for accurately calculating travel times are
needed to maintain the message sign policy.
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