i-394 mnpass technical evaluation preliminary findings march 23, 2006 doug sallman – cambridge...
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I-394 MnPASS Technical EvaluationPreliminary FindingsPreliminary Findings
March 23, 2006March 23, 2006
Doug Sallman – Cambridge Systematics, Inc.Doug Sallman – Cambridge Systematics, Inc.
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Overview• Evaluation Objectives
•Evaluation Challenges
•Evaluation Approach
•Preliminary Findings
•Next Steps
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Objectives• Conduct an independent assessment of
the performance impacts resulting from the I-394 MnPASS deployment including:– Travel times/speeds– Vehicle and person throughput– Safety– Noise and emissions
• Investigate other issues including transit operations, enforcement and revenue
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Approach• Collect data representing a broad period
before and after to control for: – Traffic growth trends– Cyclical variations (day-of-week, time-of-year)– Weather conditions– Incident occurrence– Other external factors
• Compare performance from like periods with and without MnPASS to isolate any changes
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Challenges• MnPASS system itself is dynamic
• Hours of operation change
• Construction of auxiliary lane in the westbound direction
• Closure of I-494 to I-394 ramps
• Record high fuel prices
• Changes to transit routes and fares
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Preliminary Findings• Interim performance evaluation
focuses on the period from June to December 2005– Does not include data from the initial
period of 24/7 operation
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Preliminary FindingsVolumes/Throughput
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Volume/Throughput• Regional automobile travel demand
has decreased compared to previous years, unrelated to MnPASS– Nearly 2% decrease in peak hour
volumes on I-35W
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Volume/Throughput• I-394 MnPASS lanes peak hour
volumes increased 9 to 33%
• Total I-394 peak hour roadway volumes increased by up to 5%
• Volume changes on the fringes of MnPASS operational hours were less positive or lower
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Preliminary Findings Speeds
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Vehicle Speeds• Despite increase in volume, speeds
in the MnPASS lane have not decreased
• Travel speeds in the general purpose lanes increased by 2 to 15 percent– The relative speed change is most
significant when conditions are most congested
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Preliminary Findings Safety
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Preliminary Findings Safety
• Time lag in collecting crash data does not yet allow for statistical analysis of safety impacts
• Anecdotal information and informal review of MnDOT’s incident log suggests no negative impact
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Preliminary Findings Enforcement
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Preliminary Findings Enforcement
• Over 3,300 stops were made by enforcement officers on the I-394 corridor
• 50% of stops involved HOV or double white line crossing violations
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Preliminary Findings Enforcement
• Violation rates have dropped at nearly all I-394 locations
• Violation rates on I-394 are much lower than on I-35W
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Preliminary Findings Noise and Emissions
• MnDOT conducted monitoring and analysis has revealed no noise or emissions impacts
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Preliminary Findings Use and Revenue
• Use and revenue have increased steadily
• Number of transponders has increased from 5,650 to over 9,000– Continues to increase at 3% growth
• Average owner uses the MnPASS lane twice a week
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Preliminary Findings Use and Revenue
• Over 500,000 tolls were paid in 2005 resulting in $350,000 in toll revenue
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Next Steps• Additional field data collection planned for
Spring to better assess carpool impacts
• Interviews with transit operators
• Continue to collect and analyze automated data through July
• Assessment of safety issues
• Final Evaluation Report due in August
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Questions?