analysis of the ih 35 corridor through the austin metropolitan area trb planning applications...
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Analysis of the IH 35 Corridor Through the Austin Metropolitan Area TRB Planning Applications Conference . Jeff Shelton Karen Lorenzini Alex Valdez Tom Williams. May 8, 2013. Acknowledgements. University of Arizona RST International TxDOT CAMPO CTRMA Capital Metro City of Austin - PowerPoint PPT PresentationTRANSCRIPT
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Analysis of the IH 35 Corridor Through the Austin Metropolitan Area
TRB Planning Applications Conference
Jeff SheltonKaren Lorenzini
Alex ValdezTom Williams
May 8, 2013
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Acknowledgements
• University of Arizona• RST International• TxDOT• CAMPO• CTRMA• Capital Metro• City of Austin• Downtown Austin Alliance
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Introduction
• Austin among the fastest-growing cities in the U.S.• Average travel times from downtown to Round Rock (45 – 60 mins) during afternoon peak
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Introduction
• Funding only available for incremental improvements
• Need to start planning for the “Big Picture”
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Introduction
What is the long-term solution for IH 35 through the
Austin Metropolitan Area?
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Introduction
• Pre-conceptual, unbounded by financial constraints
• Framework for preliminary screening of options
• Advanced research tool for advanced research challenge
• Use different resolution levels to meet challenge (TDM DTA)
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Public Notions about IH 35
• Through (bypass) traffic causing congestion• Truck traffic major problem• We can build our way out of congestion
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Technical Approach – Demand Side
• Analysis year 2035 for all scenarios• Travel demand model starting point: CAMPO
regional travel demand model • Multiple vehicle class trip tables• SOV, HOV2/HOV3+, Truck
• All other 2035 adopted plan roads and transit network included
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Technical Approach – Demand Side
• Scenario 0 (Base model)
• Concurrent with CAMPO adopted plan
• No additional vehicle capacity along IH 35 between SH 45 North and SH 45 South
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Technical Approach – Supply Side
• Dynamic traffic assignment (DynusT) • Assignment is modeled in 1-minute
intervals• Traffic signals coded on all major arterials• Innovative congestive-responsive tolling
algorithm
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Congestive Responsive Tolling
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Congestive Responsive Tolling
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Congestive Responsive Tolling
Maximize throughput while maintaining target speed
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Challenges
• Network size• Run time• Signal timings• Multiple vehicle classes• Dynamic tolling algorithm• Outputs
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Concept Scenarios
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Base Model• Concurrent with the
current CAMPO adopted plan
• No additional vehicle capacity along IH 35 between SH 45 North and SH 45 South
• All other 2035 CAMPO Adopted Plan Roads and Transit Network included
HOV laneStatic tollDynamic toll
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Scenario 1• One express lane added
each direction to IH 35, non-tolled
• SOV and trucks restricted• Dynamic tolling MoPac and
SH 183• Toll for HOV3+
HOV laneStatic tollDynamic toll
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Scenario 2• Dynamic pricing IH 35• Min toll ($0.25)• Max toll ($200.00)• HOV 3+ free
• Independent tolling scheme on other facilities
HOV laneStatic tollDynamic toll
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Scenario 3• System-wide dynamic
pricing • IH 35• HOV 3+ free
• All other facilities, HOV pays
HOV laneStatic tollDynamic toll
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Scenario 4• Dynamic pricing IH 35• Add one additional
express lane each direction
• Remove one general purpose lane each direction
• Remove tolls SH 130/45 and redesignate as interstateHOV lane
Static tollDynamic toll
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Scenario 5• No added capacity• Toll existing IH 35 main
lanes• Peak period dynamic
pricing • 6-9 AM• 4-7 PM
• Remove tolls SH 130/45 and redesignate as interstateHOV lane
Static tollDynamic toll
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Scenario 6• Three additional express
lanes in each direction• Elevated or depressed• Access only at endpoints• Dynamically tolled• HOV3+ free• SOV min toll ($9.94)• Truck min toll ($31.58)
HOV laneStatic tollDynamic toll
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What did we find out?
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Base Scenario
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Scenario 1
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Scenario 2
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Scenario 3
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Scenario 4
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Scenario 5
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Scenario 6
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Results
31
Base 1 2 3 4 5 6Base SC1 SCS2 SC3 SC4 SC5 SC6
2,400,000
2,450,000
2,500,000
2,550,000
2,600,000
2,650,000VHT - Internal Trips
VHT
(hrs
)
Base SC1 SCS2 SC3 SC4 SC5 SC614,00014,50015,00015,50016,00016,50017,00017,50018,00018,50019,000
VHT - External Trips
VHT
(hrs
)
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Shortest Path?Base Scenario Scenario 5
Majority of truck traffic already using SH 130 to bypass central downtown core
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What did we learn?
• Recurring congestion caused by daily commuters – NOT through traffic
• Removing truck traffic from IH 35 fills with latent demand
• Added pavement (highest $) did not show promising results
• Biggest problem is growth trends and “business as usual” travel behavior
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People Make More Trips Outside of Peak Period
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 240
200,000
400,000
600,000
800,000
1,000,000
1,200,000
TOTAL HOURLY TRIPS
2015 2035: Scenario 0 Base
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What would it take?
• From CAMPO 2035 plan• Two express lanes in each direction – One of these lanes is on-going
express lane implementation project
– Length from SH 45N to SH 45 SE
– Intermediate access points– SOV/HOV pay an auto toll
rate, transit free– Dynamically tolled
Travel Behavior Changes Trip reduction per household Travelers shorten travel
distances somewhat Peaks spread into non-peak
periods HOV3 , Transit, and non-
motorized travel increases 125%
Added Capacity High Efficient Land Use
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People Make More Trips Outside of Peak Period
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 240
200,000
400,000
600,000
800,000
1,000,000
1,200,000
TOTAL HOURLY TRIPS
2015 2035: Scenario 0 Base What Would It Take?
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What would it take?
10 mph
20 mph
30 mph
40 mph
50 mph
60 mph
Riverside
SH 45
US 183
SH 45
Riverside
SH 45
US 183
SH 45
2:00
4:00
6:00
8:00
10:0
0
12:0
0
2:00
4:00
6:00
8:00
10:0
0
2:00
4:00
6:00
8:00
10:0
0
12:0
0
2:00
4:00
6:00
8:00
10:0
0
IH 35 Ext to Ext (Northbound) IH 35 Ext to Ext (Southbound)
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Moving Forward
• Educating decision-makers/public about myths • Pursuing demand side strategies– Employers– Individuals– Public policy (including land use)
• Defining specific long-term capacity improvements• Expand modal options/accessibility• Leverage new technologies• Continue to refine model tools
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Thank You