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

In-House Access Management Division

Design Category: Diverging Diamond Interchange

Reviewed access requests and permits throughout the state. Analyzed plans for meeting all intersection standards and requirements. Reviewed all cost estimates for permits. Unique intersections reviewed included a diverging diamond{…}

MD 295 Planning Study

Design Category: Diverging Diamond Interchange

Project studied approximately three mile stretch from MD 100 to I-195. Involved widening highway and adding a new interchange at Hanover Drive to provide better access to BWI Airport facilities.{…}

Operational Effects of DDIs and Adjacent Intersections

Design Category: Diverging Diamond Interchange

Project will be evaluating the traffic and operational characteristics of DDIs and the intersections that are adjacent to them to improve traffic flow for all users.