01739038

Monograph

http://www.trb.org/Main/Blurbs/180649.aspx

As traffic demand increases, the use of alternative intersections, such as roundabouts, diverging diamond interchanges, J-turns, median U-turns, and continuous flow intersections, is becoming more prevalent within the United States. An alternative intersection is an intersection where traffic movement is re-routed from a traditional intersection form to remove major conflict points. This synthesis report documents the evaluation and selection processes within state departments of transportation for intersection projects. Information for this study was gathered through a literature review, a survey of state departments of transportation, and follow-up interviews with selected agencies. Six case examples provide additional information on alternative intersection design and selection practices. A key finding of the synthesis was that DOTs use several different approaches and tools for the evaluation and selection of intersection types. Nine states have implemented Intersection Control Evaluation (ICE) policies that provide procedures for screening, analysis, selection, documentation, and approval of alternative intersections. DOTs have found ICE policies to be beneficial for standardizing procedures, documenting the decision-making process, and promoting the use of alternative intersections.

Project 20-05, Topic 50-11

English

219p

2020

NCHRP Synthesis of Highway Practice

9780309481380

Digital/other

Appendices; Figures; Photos; References; Tables

Decision making; Diamond interchanges; Evaluation; Highway design; Highway safety; Intersections; Roundabouts

Design; Highways; Operations and Traffic Management

TRIS, TRB, ATRI

May 13 2020 11:43AM