Introducing a whole set of courses dedicated to learning about the diverging diamond interchange. These courses have been given in the past to audiences of students, public agency officials, and consultants. Now they are available to everyone. For more information about the diverging diamond interchange or to schedule a course in your area, please visit our website at www.divergingdiamond.com


I-75 at SR 72 (Clark Road) Interchange

Design Category: Diverging Diamond Interchange

The purpose of this project is to reconstruct the existing I-75 at Clark Road interchange facility to the ultimate configuration as defined in the Project Development and Environment Study (PD&E).{…}

I-75 and SR 884 (Colonial Boulevard) Interchange

Design Category: Diverging Diamond Interchange

The interchange of I-75 and Colonial Boulevard needs to be improved to accommodate future traffic growth due to development in the vicinity of the interchange and is anticipated to enhance{…}

9th Avenue at Langley Avenue and Tippin Avenue Intersection Improvements Roundabout

Design Category: Roundabout

Provided conceptual design of a roundabout at the intersection of 9th at Langley Avenue and Tippin Avenue. The two-lane four-leg roundabout alternative was considered as an improvement option to alleviate{…}

Central US 1 Sector Plan Transportation Study

Design Category: Diverging Diamond Interchange

Identify and evaluate Transportation Demand Management (TDM) and mobility strategies to improve corridor. Developed typical sections and roadway plan for US 1 with innovative bicycle and pedestrian improvements. Evaluated transit{…}

Diverging Diamond Interchange Studies

Design Category: Diverging Diamond Interchange

Conducted many different studies related to the Diverging Diamond Interchange (DDI). Studies include Comparison of the DDI to Other Diamond Interchange Forms, Comparison of the DDI to Other Cloverleaf Forms,{…}

Floresta Drive and Polynesian Avenue Roundabout

Design Category: Roundabout

Provided design for roundabout at intersection of Floresta Drive and Polynesian Avenue. The roundabout was designed for a four-lane divided roadway with single lane exits serving the connecting local roads.

Floresta Drive and Southbend Boulevard Roundabout

Design Category: Roundabout

Provided design for roundabout at intersection of Floresta Drive and Southbend Boulevard. The roundabout is designed to accommodate four-lane divided roadways with future considerations within the circulating roadway. This roundabout{…}

Floresta Drive and Thanksgiving Avenue Roundabout

Design Category: Roundabout

Provided design for roundabout at intersection of Floresta Drive and Thanksgiving Avenue. The roundabout was designed for a four-lane divided roadway with single lane exits serving the connecting local roads.

Floresta Drive and Thornhill Drive Roundabout

Design Category: Roundabout

Provided design for roundabout at intersection of Floresta Drive and Thornhill Drive. The roundabout was designed to replace the existing signalized intersection and accommodate the four-lane divided roadway and the{…}

Greenbelt Metro TOD Project

Design Category: Diverging Diamond Interchange

A TOD project at the Greenbelt station on the DC Metrorail Green Line which is on the northeast side of the Capital Beltway. The project involves converting the large parking{…}