Nick Falbo, 23/2/2014
This site will develop into a clearinghouse for exploration, examples, images, references related to the Protected Intersection design concept. Learn more in the video below, proposed for the George Mason University 2014 Cameron Rian Hays Outside the Box Competition.
Due to the nature of video presentation, not all concepts, statements and visuals are supported with the subtle details deserving of such a complex topic.
Download the annotated transcript to the video, with footnotes and details about the design presented here.
While the Protected Intersection design has promise, implementation is fraught with serious challenges. This site will identify and explore these issues with the goal of understand how and if these tools can be use on US streets. Known issues include:
Coming Soon – Including drawings of truck turning movements and alternate lane configurations.
See below for examples of intersections from around the world using similar elements to to the design shown here.
These design elements are uncommon in the US, and have had limited professional or academic study here. Existing resources from bloggers, advocates, and students offer a great start to understanding these concepts further.
Junction design the Dutch – cycle friendly – way
A View from the Cycle Path
Sustainable Transportation in the Netherlands
The body of research to support these designs is growing every year. The list below is a work in-progress, intended to identify key supporting studies, literature, and guidelines on this topic.
Mitigating the Right Turn Conflict Using Protected-Yet-Concurrent Phasing for Cycle Track and Pedestrian Crossings by Furth, P., Koonce, P., Miao, Y., Peng, F., Littman, M. submitted to the TRB 2014 annual meeting.
The December 2013 Interim Approval for biycle signals opened the door for simplified implementation of bicycle signals under certain limited conditions. However, use of bicycle signals for simultaneous green or leading bicycle interval phasing is explicitly prohibited by the approval, and requires an experimentation process by the FHWA.
The Dutch CROW Design Manual for Bicycle Traffic is the national guide to bikeway network and facility design in the Netherlands. Built off decades of experience in designing for bicycle users, the CROW manual describes design dimensions and considerations for bikeway implementation, including guidances for bent-out bicycle crossings, bicycle turn storage areas and bikeway signalization.
D Pedler, A; Davies, G. Cycle track crossings of minor roads. 2000. TRL Report462.
Nick Falbo is an Urban Planner and Designer at Alta Planning + Design in Portland, Oregon. At Alta, Nick contributed to the NACTO Urban Bikeway Design Guide and has had his hands in bicycle and pedestrian master plans across the country.
All views expressed here are my own. The concepts presented in the Protected Intersection for Bicyclists video are exploratory and experimental, and do not necessarily reflect the position or endorsement of my employer.