July 20-24, 2014

Hilton Salt Lake City Center, Salt Lake City, Utah

Welcome and Opening Presentations

 Moderator: Jeffrey Shaw, Federal Highway Administration


Mike Griffith, Federal Highway Administration

Shane Marshall, Utah DOT

Robin Hutcheson, Salt Lake City

Gilbert Chlewicki, ATS-American


1A) Alternatives Evaluation

 Moderator: Brian Ray, Kittelson


• David Gerstle, Caliper - Microsimulation for AI’s: Operations, Visualization, and Route Choice

• Milan Zlatkovic, University of Utah – Performance Matrix for Evaluating Alternative Designs


1B) Safety Performance Part I

Moderator: Ingrid Potts, MRI Global


• Wei Zhang, Federal Highway Administration - Crash Prediction Models for Rural Restricted Crossing U-Turn intersections

• Chris Cunningham, ITRE/NCSU - Safety Effects of Unsignalized Superstreets in NC


1C) Operational Effects Part I

 Moderator: David Cox, Federal Highway Administration


• Shaikh Ahmad, Purdue University - Capacity-related Driver Behavior on Roundabouts – Speed, Trucks, and Nighttime Conditions

• Xianfeng Yang, University of Maryland - Design and Performance Evaluation for Superstreet Intersections

• Eric Rasband and Matthew Luker, Utah DOT - Utah Experience with CFI and DDI Corridors


2A) Implementation Lessons Part I

 Moderator: Larry Sutherland, Parsons Brinckerhoff


• Brenton Bogard, Ohio DOT; Brian Toombs, Burgess Niple - Implementation of the First DDI in the State of Ohio

• Mike Wahlstedt, Transystems - Diverging Diamond Interchanges in Kansas City

• Hermanus Steyn, Kittelson – OR213: I-205 to Redland Road Overcrossing (OR213 Jughandle Project)


2B) DDI Insights - Design

 Moderator: R.J. Porter, University of Utah


• Joel Leisch, Consultant - DCD/DDI Interchanges

• Chris Vaughan, ITRE/NCSU - Common Problems at Double Crossover Diamond (DCD) Interchanges and Nearby Intersections

• Gang-Len Chang, University of Maryland - Development of a Multi-stage Design System for Diverging Diamond Interchange


2C) Screening Tools and Methods

 Moderator: Katy Salamati, ITRE/NCSU


• Yao Cheng, University of Maryland - Maryland Unconventional Intersection Design (MUID):

        A Useful Tool to Design and Evaluate Alternative Intersections

• John Sangster, Leidos - Operational Limitations of Alternative Intersections: Implications of the CAP-X Software

• Brian Ray, Kittelson - Intersection Control Evaluations


3A) Integrating Peds & Bikes Part I

 Moderator: Brooke Struve, Federal Highway Administration


• Janet Barlow, Accessible Design for the Blind - Accessible Design Considerations for Intersections

• Anne Holzem, Patrick Eng. - Impact of Superstreet Operations on Pedestrians and Bicyclists

• Gilbert Chlewicki, ATS-American – Using the concept of the Continuous Flow Intersection to improve pedestrian movements at intersections


3B) DDI Insights - Adaptability

 Moderator: Michael Shepard, Florida DOT


• Smith Siromaskul, HDR - Evolving the DDI

• Wei Zhang, Federal Highway Administration - Unlock DDI’s Capacity Potential Using Relaxed Bowtie Design at Adjacent Signal Intersection

• Lynn Jacobs, Fehr & Peers - How to handle the skew: Introducing the Offset Diverging Diamond Interchange (O-DDI)


3C) Exploring New Concepts Part I

 Moderator: Grant Schultz, BYU


• Ausrius Juozapavicius - Interchange of a new generation PINAVIA


• Michael Gingrich, AIC - Cost and Constructability Comparison of the DCMI Inter- change

• Blake Unguren, Avenue Consultants; Matt Luker, Utah DOT - 5400 South FlexLanes Corridor


4A) Implementation Lessons Part II

 Moderator: Brian Fouch, Federal Highway Administration


• Mike Reese and Sean Epperson, North Carolina: Justin Carroll, Town of Huntersville - North Carolina’s First Quadrant Left: History and Lessons Learned


• Jon Nepstad, Fehr & Peers - The First One Through the Door – How Utah Got its First CFI

• Brandon Bourdon, Kimley-Horn – Constructed Diverging Diamond Interchange with Center Running Light Rail Transit


4B) Safety Performance Part II - Grand AB

 Moderator: Betsey Tramonte, Federal Highway Administration


• Adam Kirk, University of Kentucky - Quantitative Safety Evaluation of Alternative Intersection Designs

• Laurence Lambert, Stantec - Safety & Pedestrian Experience of the CFI


4C) Exploring New Concepts Part II

 Moderator: Eric Donnell, Penn State


• Chris Malmberg, HDR - Innovative Five-Legged Intersection Concept

• Michael Mosley and Wole Johnson, Kimley-Horn; - Visualization: Communication in Design

• Gilbert Chlewicki, ATS-American - Are Left-Side Ramps Inherently Evil or Can There Be Some Benefits?


5A) Integrating Peds & Bikes Part II

 Moderator: Kay Fitzpatrick, TTI/TAMU


• Kristy Jackson, ITRE/NCSU - Observations of Pedestrian and Bicycle Behavior and Facilities at Double Crossover Diamond Interchanges

• Julie Bjornstad, Fehr & Peers - Pedestrian and Bicycle Design Considerations at Innovative Intersections and Interchanges

• Nick Falbo, Alta Planning – Protected Intersections for Protected Bike Lanes


5B) State DOT Perspectives

 Moderator: Kent Belleque, Oregon DOT


• Fred Doehring, Utah DOT - Utah DOT - Innovative Intersection Leader

• Mike Reese, North Carolina DOT - Innovative Intersection and Interchange Design Concepts in North Carolina

• Saed Rahwanji and Minseok Kim, MD SHA - State of the Practice, Case Studies and Analysis Tools on Unconventional Intersection & Interchange Designs in Maryland


5C) Operational Effects Part II

 Moderator: Jon Soika, VHB


• Chris Cunningham, ITRE/NCSU - Operational Effects of Signalized Superstreets in NC

• Anuj Sharma, University of Nebraska - Evaluation of Operational Performance of Median U Turn (MUT)


Guided Bus Tour

Moderator: Fred Doehring, Utah DOT; Samit Dao, Avenue Consultants

This shuttle bus tour will take participants on a route through several alternative intersections and interchanges in the immediate Salt Lake City area. Local experts will serve as tour guides and provide background information on the projects/locations. The route includes:



• Diverging Diamond Interchange

• Continuous Flow Intersections

• ThrU-Turn intersection

• Single Point Interchanges

• Roundabouts



Mini Workshop 1: Diverging Diamond Interchanges - Design Insights and Innovations

With the first few dozen DDIs constructed and operational in the U.S., there are many valuable lessons that have been learned.  Expert designers will relate their project experiences on planning and designing DDIs across the United States, including some innovative variants of DDIs.


• Gilbert Chlewicki, ATS-American

• Joel Leisch, Consultant Diverging Diamond Interchange

Smith Siromaskul, HDR


Mini Workshop 2: Operational Analysis Tools & Techniques for Alternative Intersections

Several operational analysis tools will be highlighted, with tips and techniques demonstrated using case study examples from alternative intersection and interchange projects. The workshop will

explore the differences between several of the most popular analysis tools and explain the similarities and differences in the models.


• Ram Jagannathan, Leidos

• Jim McCarthy, Federal Highway Administration - US 212 Safety Program Use 2010 HCM for RCUT

• Michael Armstrong for Lily Elefteriadou, University of Florida - Integrating Alternative Intersections & Interchanges into HCS 2010

• Bastian Schroeder, ITRE/NCSU - Diverging Diamond Interchanges (DDI) in the HCM


Mini Workshop 3: Overview of New FHWA Informational Guides

A “guided tour” of the new FHWA series of stand-alone Informational Guides on the following alternative intersections/interchanges: Diverging Diamond Interchange, Displaced Left Turn Intersection, Median U-Turn Intersection and Restricted Crossing U-Turn Intersection.


Overview of New FHWA Informational Guides

• Mark Doctor, Federal Highway Administration

• Brian Ray, Kittelson

• Hermanus Steyn, Kittelson

• Andy Daleiden, Kittelson

• Pete Jenior, Kittelson


Mini Workshop 4: Managing Access & Expectation

A public outreach and involvement effort on innovative intersection projects is essential to success. Additionally, provisions for access to homes or businesses adjacent to any road project can be as controversial as the project itself, suggesting that managing access is also related to managing expectations and clearly communicating trade-offs. Recent experiences and ongoing research will provide insight on how to approach managing both access and expectations effectively.


• Karen Dixon, TTI/TAMU

• Phil Demosthenes, Consultant - Access Expectations and Access Rights Near Major Intersections

• Mike Brown, Metro Analytics - Getting More Great Designs into More Places

• Laycee Kolkman, HDR and Dan Avila, Utah DOT - Managing Access and Expectations



6A) Implementation Lessons Part III

 Moderator: Marcus Brewer, TTI/TAMU


• Brian Walsh, Washington State DOT – Washington State Experiences on Temporary Alternative Intersection Applications

• Lynn Jacobs, Fehr & Peers; Ashford Galbreath, Wadsworth Bros. - Temporary Innovative Intersections for MOT During Construction

• Jose Rodriguez, HDR; Eric Rasband, Utah DOT - Constructability Issues and Lessons Learned on I-15 DDI in Utah


6B) DDI Insights - Signalization

 Moderator: Zoubir Ouadah, Wilson


• Theresa Rohlfs, Trafficware - Understanding Signal Timing Issues of Diverging Diamond Interchanges

• Bastian Schroeder, ITRE/NCSU - Signal Phasing Options at Double Crossover Diamond (DCD) Interchanges using a Single Controller

• Gerry de Camp - Signal Phasing Schemes for Operating Diverging Diamond Interchanges


6C) Exploring New Concepts Part III

 Moderator: Mark Doctor, Federal Highway Administration


• Corey Krause, Federal Highway Administration - Operational Advantages of Dynamic Reversible Left Lane Control of Existing Signalized Diamond Interchanges

• Joel Marcuson, Consultant - Signalizing Circulating Intersections/Interchanges

• Peng Hao, CERT/UCR - Improve Traffic Operation at Signalized Intersections using Four Quadrant Connection Roadways


Closing Plenary


Papers included with these presentations have not been peer reviewed.


Supported by


PTV Group                             L2 Data Collection                Transoft Solutions                   Rodel Interactive Roundabout Analysis Software

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