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I-394 MnPASS Technical Evaluation
Doug Sallman – Cambridge Systematics, Inc.Doug Sallman – Cambridge Systematics, Inc.
Overview• Objectives• Challenges • Approach • Findings• Lessons Learned
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
• Investigate other issues including enforcement and revenue
Approach• Collect data representing a broad period
before and after to control for: – Traffic growth – 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
Evaluation 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• Adjustment to pricing algorithm
Findings
Volume/Throughput• Regional automobile travel demand
has decreased compared to previous years, unrelated to MnPASS– Nearly 3% decrease in peak hour
volumes observed on other regional corridors
Volume/Throughput• In light of the regional changes…
– I-394 MnPASS lanes peak hour volumes increased 7 to 30%
– Total I-394 peak hour roadway volumes increased by up to 4%
– Volume changes on the fringes of MnPASS operational hours were less positive or even slightly lower
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 greatest when conditions are most congested
Safety• Number of corridor crashes has decreased by 12
percent in the year following MnPASS deployment, compared with the previous years
400
450
500
550
600
2003-04 2004-05 2005-06
Annual
Cra
shes
on I-3
94 Average 2003-05 =560
Enforcement• Over 2,300 stops
were made by enforcement officers on the I-394 corridor in the first year for HOV or double white line crossing violations
HOV Violation RatesLocation Pre-
MnPASSWith
MnPASS
I-394 Reversible Section
7% 4%
I-394 Diamond Lane Section
20% 9%
I-35W HOV Control Section
23% 33%*
* I-35W HOV control corridor not equipped with MnPASS
Fee Revenue16%
Toll Revenue84%
Use and Revenue• Average toll paid is
now above $1• Total revenue is
over $2 million (Opening to July 15, 2006 )
• Toll revenue approximately $4,000 per week
Evaluation Lessons Learned
+ Evaluation team established early
+ Robust automated data collection system
+ Long-time horizon
+ Use of control corridor to assess regional changes
- Occupancy data collection