Post on 20-Jan-2015
description
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Data to Support Performance Targets for Meeting National Goals
AASHTO Performance Management CommitteeFebruary 24, 2009
George Schoener, Executive DirectorI-95 Corridor Coalition
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Use of Travel Time and Speed for Measuring Performance
Congestion and System Operations
Freight
Environment
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Uses of Travel Time/Speed Data: Congestion and System Operations
Can be used to support congestion and reliability metrics• Delay, Travel Time Index
Probe data provide coverage on most highways, not just those with instrumentation, but volumes cannot be obtained • Need to supplement with traditional traffic counts to
combine with travel times to estimate delay
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Uses of Travel Time/Speed Data: Freight
Average speed on Interstate/NHS corridors• Fleet data ideally suited to long distance travel
• Current examples• ATRI “National Speed Maps”
• I-95 Corridor Coalition project on intercity travel time performance
Average time to cross borders• May require special processing of fleet data by
vendors
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Uses of Travel Time/Speed Data: Environment
Transportation-related air quality emissions• Can provide detailed speed measurements for
emissions models • Moves away from predicting speeds with models
• Time of day by facility
Green house gas emissions• Speed also a key determinant of fuel consumption
and CO2 production from vehicles
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What We Get: I-95 Corridor Coalition Demonstration with
INRIX
Data• Current Speeds/Travel Times
• Historical and Free Flow Speeds
• For Segments between interchanges
• Updated every minute
Coverage (as of Feb ‘09)• Freeways: 2857 miles
• Arterials: 870 miles
• From NJ to NC
• ~ 9000 Road Segments
• Easy to add/change coverage
Liberal Use Rights• Any agency use
• Real-time or off-line
• Can archive data
• Can’t resell/ redistribute to 3rd parties
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Data Quality Contract Requirements/Agency Needs: Avg Error < 10 MPH Data meets contract quality specifications Coalition/UMd utilized novel “Bluetooth” approach for
evaluation• Largest evaluation ever of this kind in U.S.
• 54 segments, 111 miles
• 1,500+ hours,19,000+ observations
• 4 states over 4 months
Quality monitoring ongoing• Payment tied to quality
Speed Range (MPH)
Average Absolute Error (MPH)
< 30 5.930-45 6.945-60 2.3> 60 2.3
Overall 2.5
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What It Costs Per centerline mile fees Limited Access Roadways
• Mobilization: $150/mile (one time fee)
• Data Costs: $750/mile (annual fee)
• << Less than sensor O&M costs
Arterials/State Highways• Exact fees TBD
• Likely less than above
• ~850 miles free for 3 yrs
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INRIX Source Data
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• Taxis, limos, airport shuttles• Service delivery vehicles• Long haul trucks and Less than
Truckload (LTL) vehicles
• Loop sensors• Radar detectors
• Cellular probe data• Toll tags
Benefits
• Coverage• Data Accuracy
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• Billions of data points, average latency of 2-7 minutes, 24x7
• Majority of vehicles exclusive to INRIX
• Broad mix of vehicle/fleet types, driving patterns
• Constant data through day, particularly during commute hours
GPS Probe Data Overview
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Mobility“Is the road I’m traveling on reliable?”
Using INRIX data, summarize applicable datasets to determine the following candidate system performance measures:• Average Travel Time
• 95% Reliable Travel Time
• Average Duration of Congestion
• Travel Time Index Compare differentials of these measures on an annual basis
(e.g., changes between 2007 and 2008). • Can be presented system-wide, by road type (e.g.; interstate
vs. arterial) or selected travel corridors.
10 Year Target:No increase in the above measures over an established baseline (e.g.; 2008)