Post on 01-Jan-2016
description
Analysis of the IH 35 Corridor Through the Austin Metropolitan Area
TRB Planning Applications Conference
Jeff SheltonKaren Lorenzini
Alex ValdezTom Williams
May 8, 2013
Acknowledgements
• University of Arizona• RST International• TxDOT• CAMPO• CTRMA• Capital Metro• City of Austin• Downtown Austin Alliance
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
Introduction
• Funding only available for incremental improvements
• Need to start planning for the “Big Picture”
Introduction
What is the long-term solution for IH 35 through the
Austin Metropolitan Area?
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)
Public Notions about IH 35
• Through (bypass) traffic causing congestion• Truck traffic major problem• We can build our way out of congestion
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
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
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
Congestive Responsive Tolling
Congestive Responsive Tolling
Congestive Responsive Tolling
Maximize throughput while maintaining target speed
Challenges
• Network size• Run time• Signal timings• Multiple vehicle classes• Dynamic tolling algorithm• Outputs
Concept Scenarios
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
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
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
Scenario 3
• System-wide dynamic pricing • IH 35• HOV 3+ free
• All other facilities, HOV pays
HOV laneStatic tollDynamic toll
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
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
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
What did we find out?
Base Scenario
Scenario 1
Scenario 2
Scenario 3
Scenario 4
Scenario 5
Scenario 6
Results
31
Base 1 2 3 4 5 6
Base SC1 SCS2 SC3 SC4 SC5 SC62,400,000
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 SC614,000
14,500
15,000
15,500
16,000
16,500
17,000
17,500
18,000
18,500
19,000VHT - External Trips
VHT
(hrs
)
Shortest Path?Base Scenario Scenario 5
Majority of truck traffic already using SH 130 to bypass central downtown core
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
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?
• 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
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?
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)
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
Thank You