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


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{…}

Greenbelt Planning Study

Design Category: Roundabout

Study involved analyzing all critical intersections in the City of Greenbelt for operational and safety improvements for motorized vehicles, pedestrians, and bicycles. Included in the study are a proposed diverging{…}

Harsen’s Island Roundabout

Design Category: Roundabout

Providing design for a roundabout on the mainland to tie the proposed bridge into M-29. All traffic using M-29 will also use this roundabout. An analysis was also conducted in{…}