Protected Intersection Design and Implementation

As of December 2015, there are six locations in North America that qualify as protected intersections. The protected intersection is fast becoming an accepted and implemented treatment type and would meet NACTO’s tests for inclusion in the next edition of the Urban Bikeway Design Guide.

During our work on the development of the NACTO Urban Bikeway Design Guide, Alta staff saw merit in the Dutch junction style design and have spent subsequent effort studying it and attempting to create a framework for adapting it to the North American roadway context.

Through our work designing Salt Lake City’s first protected intersection, Alta engineers and designers have explored the research status, regulatory implications, and fundamental geometric design principles surrounding the protected intersection design. We share the results of this exploration in our white paper in the hopes that more jurisdictions will adopt the design to raise the safety and comfort of their current and future bikeway designs.