Guidelines for Selection of Speed Reduction Treatments at High-speed Intersections
Guidelines for Selection of Speed Reduction Treatments at High-Speed Intersections (the Guidelines) assists roadway planners, designers, and operators as they consider and select appropriate speed reduction treatments at intersections located in highspeed environments. The Guidelines are not a new standard for implementing treatments. Rather, they are informational, describing good practices for selecting treatments. These Guidelines were produced as a part of NCHRP Project 3-74, which studied speed reduction treatments for high-speed intersections. This project focused on physical treatments (geometry, signing, striping), rather than on enforcement. For the purposes of this report, high-speed intersections are defined as intersections where the posted speed limit is 45 mph or greater on one or more approaches. In some cases, speeds through the intersection proper may be greater than 45 mph (e.g., major street approaches at two-way, stop-controlled intersections). In other cases, speeds at the intersection may be closer to zero (e.g., signalized intersections approached on red). The driver workload and desired response vary with these conditions along with a variety of other roadway and environmental features. To help Guidelines users select an appropriate treatment, the Guidelines focus on providing an understanding of all the elements that may affect conditions at a high-speed intersection. A wide variety of treatments is presented in the Guidelines. As part of this research effort, some of the treatments were tested to determine how effectively they reduce speeds. The results of these tests, as well as the results of other studies, are presented in the Guidelines.
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Appendix A Treatment Implementation Process Framework
Selecting an Appropriate Treatment
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Guidelines for Selection of Speed Reduction Treatments at High-speed ...
Limited preview - 2008
85th-percentile speed AASHTO affect speed Applicability and Considerations approach curvature appropriate bicycles bicyclists Caltrans Centerline rumble strips Clackamas County conﬂicts conventional intersections deﬁned deﬂection desired speed dynamic warning signs evaluate Exhibit facilities Federal Highway Administration FHWA ﬂow Guidelines high-speed intersection approaches high-speed intersection treatments horizontal curves identiﬁed impacts increase installed intersection inﬂuence area intersection proper intersection speed intersection treatments discussed longitudinal pavement markings Longitudinal rumble strips Macksburg Marysville NCHRP Project 3-74 operating speeds pedestrians posted speed potential treatments provided documented applications reduce speeds reduced lane widths roadway environment roadway segment roundabouts safety beneﬁts Safety Effects speciﬁc speed at intersections Speed Effects speed reduction treatments speed tables splitter islands stop sign stop-controlled intersections target speed Texas Transportation Institute tion trafﬁc transition area Transportation Research Board transverse pavement markings Transverse rumble strips travel lane two-lane types users Visible shoulder treatments wider longitudinal pavement WSDOT zones