1. Integrated Dynamic Travel Models: Recent SHRP2 Projects
Scott Smith
TRB National Transportation Planning Applications Conference
15 May 2017

2. Agenda
Why integrated models?
Some history
Where we are today

3. Integrated Models (SHRP2 C04 and C10)
Challenge
Traditional four-step transportation planning models deal with average conditions and treat travel as a series of sequential decisions. As such, they have difficulty addressing a number of areas including:
Travel time reliability
Variable road pricing, ramp metering, reversible lanes, variable speed limits, and other dynamic transportation management strategies
Other policies affecting travel scheduling
Consideration of trip chains and joint trip making within households
Florida DOT

4. Dynamic Traffic and Transit Assignment
History (2009 – 2013)
Models that can link travel behavior choices, such as departure time or route, with congested network conditions at a scale that can represent real-world dynamics
C10A
DaySim / TRANSIMS linkage
Burlington, Vermont; Jacksonville and Tampa, Florida
C10B
SACSIM / DaySim / DynusT / FAST-TrIPS
Sacramento, California
Presented at Planning Applications Conference in 2013 (Columbus) and elsewhere
Activity-Based Model
Dynamic Traffic and Transit Assignment

5. Integrated model system
C10A, C10B Lessons Learned
Integrated model system
is feasible
is more sensitive to a wider range of policies
produces a wider range of statistics of interest to decision-makers
Conceptual, integration and convergence issues with reconciling different types of models
Software was still immature
C10B inclusion of transit was ambitious

6. FHWA Exploratory Advanced Research (EAR) Program
Agent-Based Modeling in Transportation
2010 Workshop
2013 Primer for Agent-Based Simulation and Modeling in Transportation Applications
Virginia Tech Driver Behavior in Traffic project
Arizona VASTO project
Maryland project
Apply agent-based modeling to mode and departure time choice, pre-trip route choice, en-route diversion
Traveler Agents - Search Information Learning Knowledge
Behavioral User Equilibrium
Application of Technology Readiness Levels to Highway Projects

7. Technology Readiness Levels
 Phase
TRL
Description
Basic Research 1
Basic principles and research 2
Application formulated 3
Proof of concept
Applied Research 4
Components validated in laboratory environment 5
Integrated components demonstrated in a laboratory environment
Development 6
Prototype demonstrated in relevant environment 7
Prototype demonstrated in operational environment 8
Technology proven in operational environment
Implementation 9
Technology refined and adopted
Assess technology maturity on a 1-9 scale
Ask two key questions
How complete was the technology when it was tested?
How representative was the test environment?

8. SHRP2 Implementation Assistance, Round 4 (2014)
Jointly funded by the State DOTs
Competitive process managed by FHWA, AASHTO, TRB
Support evaluation and implementation of SHRP2 products
SHRP2 TravelWorks
Rapid Policy Assessment Tool (C16)
Improving our Understanding of How Highway Congestion and Price Affect Travel Demand (C04)
Partnership to Develop an Integrated, Advanced Travel Demand Model and a Fine-Grained, Time-Sensitive Network (C10)
For more information:

9. C04 and C10: late 2014 to present
MTC, SFCTA, PSRC Dynamic Transit Passenger Assignment with Fast-Trips (C10)
Maryland ABM and AgBMS
Integration with
DTALite (C10)
Ohio DOT CT-RAMP – DynusT (C10)
Dynamic transit passenger assignment on a large, capacity-constrained transit network
Deep integration of
ABM and DTA
Scalable integration of
DTA with both activity and agent based models
SANDAG (C04)
ARC CT-RAMP – DynusT (C10)
Pricing and Travel Time Reliability Enhancements in the SANDAG ABM

10. Further information
San Diego Pricing and Travel Time Reliability Enhancements in the SANDAG ABM (C04)
Report posted on tfresource.org
TMIP webinar took place on January 18 (
San Francisco and Seattle Fast-Trips
See fast-trips.mtc.ca.gov
TMIP webinar planned for May 24, 2pm ET
Ohio and Atlanta CT-RAMP – DynusT integration
TMIP webinars on April 5 and June 7
Maryland ABM and AgBM – DTALite integration
See
TMIP webinar took place on March 15

11. Thank you
Scott Smith Volpe Center, US DOT scott.smith at dot.gov Brian Gardner FHWA Office of Planning brian.gardner at dot.gov