Diverging Diamond Intersection
Diverging Diamond Interchange Puts Drivers on the Left Side of the Road
The unusual design improves traffic flow and reduces the danger of head-on collisions as cars enter the I-5 freeway.
On the Rise of the Diverging Diamond Interchange
Its design can appear baffling at first, but the DDI presents drivers with far fewer opportunities to collide with each other than traditional four-way intersections.
Outreach Delays New Diverging Diamond Intersection in Colorado
The diverging diamond interchange system planned for an exit off Interstate 70 in Grand Junction, west of Denver in Colorado, has been delayed so officials can educate the public about the new traffic pattern.
What a Transportation Engineer Calls "Walkable"
A transportation engineer sent Charles Marohn a video to prove how walkable his "diverging diamond" overpass design is. Marohn overdubbed his not-so-flattering reply.
Eliminating the Dreaded Left Turn
The FHWA says that 40% of all traffic accidents happen at intersections, and many of those are caused by left turns. A new type of intersection called the "diverging diamond" takes left turns out of the picture.
Licking County
Barrett Planning Group LLC
City of Cleburne
HUD's Office of Policy Development and Research
Mpact Transit + Community
HUD's Office of Policy Development and Research
City of Universal City TX
ULI Northwest Arkansas
City of Laramie, Wyoming
Urban Design for Planners 1: Software Tools
This six-course series explores essential urban design concepts using open source software and equips planners with the tools they need to participate fully in the urban design process.
Planning for Universal Design
Learn the tools for implementing Universal Design in planning regulations.
