Friday Transportation Seminar: Road Diet V2.0 - Road Diet with Roundabouts

Friday, February 16, 2018, 12:00pm to 1:00pm PST
Michael Williams, Michael Williams Company
Karl Miller Center at PSU, 631 SW Harrison St., Room 465
PDH: 1 | AICP: 1

Friday Transportation Seminar: Road Diet V2.0 - Road Diet with Roundabouts


Miss the presentation or want a look back at the slides? You can view them here.

How can we go one step, or one lane, further than the standard road diet? Roundabouts allow a road diet to reduce the final number of lanes from three to two. 

Questions arise when roundabouts are used with a road diet. What traffic volumes are supportable? Will the roundabouts fit within existing intersections? What does current guidance tell us about this approach? 

Michael Williams will present his work on creating a sequel to FHWA’s Road Diet Informational Guide. This work is intended to provide a feasibility determination tool for the application of this approach to existing corridors. Data from Bird Rock Boulevard in La Jolla, CA is presented as an example from which important lessons are drawn.

FHWA's "Road Diet Informational Guide: Download the report (PDF) / Access the 508 version here

Michael Williams' Road Diet V2.0 Informational Guide: Download the report


Michael Williams has worked on active transportation issues since 2000 as an advocate, planner, and designer. He has published and presented on advisory bicycle lanes and the use of roundabouts with road diets. Michael Williams holds a BS in Computer Engineering, an MS in Electrical Engineering, an MS in Civil Engineering and holds 11 patents. More information available at @bikepedx or

This 60-minute seminar is eligible for 1 hour of professional development credit for AICP (see our provider summary). We can provide an electronic attendance certificate for other types of certification maintenance.


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