January 13-17, 2019
Washington, D.C.
TRB 98th Annual Meeting

In Case You Missed It: Research and Best Practices for Service Interchange Designs

Sunday, January 07, 2018, 9:00 AM-12:00 PM, Convention Center 2018
Brian Toombs, Burgess and Niple, Inc.; Gilbert Chlewicki, Advanced Transportation Solutions, LLC, presiding
Sponsored by Standing Committee on Operational Effects of Geometrics; and Standing Committee on Geometric Design

The selection of the appropriate type of service interchange is influenced by many factors, such as character and composition of traffic, needs of nonmotorized users, speed considerations, degree of access control and management, environmental constraints, safety and operational benefits, and cost. This workshop reviews the basic forms of service interchanges; introduces an interchange selection procedure applicable in both urban and rural areas; shares the latest information from ongoing and upcoming research focused on innovative designs; and features a facilitated discussion on service interchange research needs. This workshop will apply what was learned to a case study example.

An Overview of Basic Service Interchanges
Mark Doctor, Federal Highway Administration (FHWA)

Review the types and characteristics of basic service interchanges, advantages and disadvantages.

Interchange Selection Process
Joel Leisch, JPL Consulting

Introduce the interchange selection procedure, including an understanding of the interchange forms applicable in both urban and rural areas and how traffic characteristics and multimodal operations drive the interchange concepts.

Research and Lessons Learned on Diverging Diamond Interchanges
Shannon Warchol, No Organization

Latest information from NCHRP project 03-113 which is focusing on learning more about the operations and safety of DDIs, and is expected to be incorporated into an update of the DDI Informational Guide.

Exploring New Service Interchange Concepts
James Dunlop, North Carolina Department of Transportation

This presentation will explore new ways to think about interchanges where we can incorporate elements from superstreets, median u-turns, CFIs, quadrant roadways, and other innovative intersection concepts.

Facilitated Discussion on Service Interchange Research Needs
Larry Sutherland, WSP

Discuss issues with current interchange designs that may require future research.  This includes issues with interchanges that have managed lane facilities, left side ramps, multimodal features and more. This discussion will help inform the preparation of future Research Need Statements.