Cell Phone Traffic Data Cell Phone Traffic Data Technology Demonstration Technology Demonstration in Minnesota in Minnesota ITS America 2007 Annual ITS America 2007 Annual Meeting & Exposition Meeting & Exposition Bernie Arseneau, Mn/DOT Rashmi Brewer, Mn/DOT Dr. Henry Liu, University of Minnesota Adam Danczyk, University of Minnesota June 2007
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Cell Phone Traffic Data Technology Demonstration in Minnesota ITS America 2007 Annual Meeting & Exposition Bernie Arseneau, Mn/DOT Rashmi Brewer, Mn/DOT.
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Cell Phone Traffic Data Cell Phone Traffic Data Technology Demonstration in Technology Demonstration in
MinnesotaMinnesota
ITS America 2007 Annual ITS America 2007 Annual Meeting & ExpositionMeeting & Exposition
Bernie Arseneau, Mn/DOTRashmi Brewer, Mn/DOT
Dr. Henry Liu, University of MinnesotaAdam Danczyk, University of Minnesota
June 2007
Advantage of Cell Phone Advantage of Cell Phone Probe-based Tracking Probe-based Tracking
• Cell Phone TrackingCell Phone Tracking– Over 215 Million Cell Phones NationwideOver 215 Million Cell Phones Nationwide– Infrastructure already presentInfrastructure already present– Offer point-to-point travel times/speeds Offer point-to-point travel times/speeds
compared with the loop detector’s compared with the loop detector’s “Estimation”“Estimation”
– Does not require installation of new Does not require installation of new detectorsdetectors
How the Cell Phone System How the Cell Phone System WorksWorks
Road Segments and Cell Boundaries
AirSage CoverageAirSage Coverage
Project PartnersProject Partners
• Mn/DOTMn/DOT– FundingFunding– Evaluation supportEvaluation support
• AirSage, Inc.AirSage, Inc.– Provides cell phone traffic data systemProvides cell phone traffic data system– Contractual agreement with Sprint, providing the Contractual agreement with Sprint, providing the
cell phone networkcell phone network
• University of Minnesota, Center For University of Minnesota, Center For Transportation StudiesTransportation Studies– Evaluation and data collectionEvaluation and data collection– Overall evaluation reportOverall evaluation report
• Hennepin CountyHennepin County– Business PlanBusiness Plan
Evaluation ApproachEvaluation Approach
• Freeway Section (I-394)Freeway Section (I-394)– Compare with loop detector travel time dataCompare with loop detector travel time data
• High Speed Signalized Roadway (T.H. 55)High Speed Signalized Roadway (T.H. 55)– Compare with floating car dataCompare with floating car data
• Based on Time of Day (AM Peak, Mid-day, PM Peak, Based on Time of Day (AM Peak, Mid-day, PM Peak, Evening, Weekend Day, Weekend Evening, etc.)Evening, Weekend Day, Weekend Evening, etc.)
• Disaggregated Scale Disaggregated Scale – Percentage of time that AirSage’s value falls Percentage of time that AirSage’s value falls
within 90% confidence intervalwithin 90% confidence interval– Exception for T.H. 55, as it does not have a Exception for T.H. 55, as it does not have a
continuous data source continuous data source
• Hypothesis TestingHypothesis Testing
Next StepsNext Steps
• Continued Data CollectionContinued Data Collection
• Statistical AnalysisStatistical Analysis
• Final Report – Fall 2007Final Report – Fall 2007
Future/OpportunitiesFuture/Opportunities
• It’s success depends on statistical It’s success depends on statistical confidence when compared with ground confidence when compared with ground truth conditionstruth conditions
• If results are positive, then cell phone If results are positive, then cell phone tracking will likely offer a promising future tracking will likely offer a promising future for travel time estimationfor travel time estimation