Getting Smart on Protected Intersections
Protected intersections are emerging as a
preferred pedestrian and bicyclist safety design treatment, yet they have not
been thoroughly investigated to identify both safety benefits and concerns. This
lack of relevant research has led to uncertainty about design details that
should be defined and standardized, resulting in limited design guidance
relating to this treatment. This research will review installations (both
domestic and international) to develop engineering guidance to standardize
application. A review of geometries, safety, maintenance needs, comfort, and impact
to traffic (including trucks) should be included. There is a need for better
information about operational impacts on all road users and impacts to
pedestrians specifically in the context of crossing distance, adjacent vehicle
speeds and proximity, pedestrian delay, etc.
This research will review existing practice in
North America and overseas, perform operations studies of protected and
unprotected intersections in the U.S., and create guidance for when, where, and
how to design and implement protected intersections.
benefits of the project include 1) standardized and optimized design practices
for future protected intersections, and 2) a better understanding of the safety
and operational implications of protected intersections.
The on-going NCHRP 15-63 project, “Guidance to Improve
Pedestrian and Bicycle Safety at Intersections,” is studying two existing
protected intersections in the US (Krista Nordback, PI).
An on-going National Institute for
Transportation and Communities (NITC) research project, “Contextual Guidance at
Intersections for Protected Bicycle Lanes,” is studying user perceptions of
safety in various protected intersection treatments (Chris Monsere, PI).
1. Document existing practice for how protected intersections
are currently designed and implemented, as
well as performance characteristics both in North America and abroad. Review geometries, safety, maintenance
issues, perceptions of comfort, impact to pedestrian mobility, and impact to motor
vehicle and truck traffic.
Conduct field studies of existing protected
intersections in terms of operations and safety, including before and after
studies for newly implemented designs and/or control intersections.
Assess the costs and benefits of the treatment.
a protected intersections design guide.
The guidance will be compiled into a user-friendly guide
complete with sample design drawings.
Protected intersections have potential safety and operations benefits to cyclists and pedestrians, but no standards have yet been established for best achieving safety and operational goals.
|Sponsoring Committee:||ANF20, Bicycle Transportation
|Research Period:||24 - 36 months|
|RNS Developer:||Krista Nordback, Alice Grossman, Rebecca Sanders, Joe Fish|
|Source Info:||Committee members and friends: Krista Nordback, Alice Grossman, Rebecca Sanders, Joe Fish|
|Index Terms:||Exclusive phasing, Intersections, Highway safety, Highway design, Traffic safety, Cyclists, Pedestrian areas, Pedestrian safety, Bicycle facilities, |
|Cosponsoring Committees:||ANF10, Pedestrians|
Pedestrians and Bicyclists
Safety and Human Factors