Safety Evaluation of Signalized Restricted Crossing U-turn Intersections PDF Download
Are you looking for read ebook online? Search for your book and save it on your Kindle device, PC, phones or tablets. Download Safety Evaluation of Signalized Restricted Crossing U-turn Intersections PDF full book. Access full book title Safety Evaluation of Signalized Restricted Crossing U-turn Intersections by Joseph E. Hummer. Download full books in PDF and EPUB format.
Author: Joseph E. Hummer
Publisher:
ISBN:
Category : Roads
Languages : en
Pages : 63
Get Book Here
Book Description
Technical summary of the FHA report FHWA-HRT-17-082 program that studied evaluated restricted crossing U-turn (RCUT) intersection and was conducted by the DCMF program for the Evaluation of Low-Cost Safety Improvements Pooled Fund Study.
Author: Joseph E. Hummer
Publisher:
ISBN:
Category : Roads
Languages : en
Pages : 63
Get Book Here
Book Description
Technical summary of the FHA report FHWA-HRT-17-082 program that studied evaluated restricted crossing U-turn (RCUT) intersection and was conducted by the DCMF program for the Evaluation of Low-Cost Safety Improvements Pooled Fund Study.
Author:
Publisher:
ISBN:
Category : Roads
Languages : en
Pages : 8
Get Book Here
Book Description
This document is a technical summary of the Federal Highway Administration report Development of a Crash Modification Factor for Signalized RCUTs (FHWA-HRT-17-082). This research examined the safety impacts of replacing a traditional signalized intersection with a signalized restricted crossing U-turn intersection (RCUT). An RCUT is defined as a three-approach or four-approach intersection where minor street left-turn and through movements (if any) are rerouted to one-way downstream U-turn crossovers. The objective was to estimate the safety effectiveness of this strategy as measured by crash frequency. The primary measures examined were based on total crashes and fatal and injury crashes. A further objective was to conduct a spatial patterns analysis, assessing notable clusters of crashes, as well as changes to crash types and day/night between the before and after periods.
Author: Saeed Niknejad
Publisher: CreateSpace
ISBN: 9781515118176
Category :
Languages : fa
Pages : 96
Get Book Here
Book Description
Directional midblock median opening with Left-Turn Lanes and Loons between four-leg signalized intersections without median openings have been designed to smooth flow of traffic especially on Main Street. Since 2004, there has been growing interest in their potential benefits as raising mental capacity of drivers due to flow instead of stop by traffic signal. This interest has created a need for data regarding the safety effect of U-Turns. In this dissertation, the effect on u-turns crashes of converting signalized intersection in Tehran from traffic signal removal to install Directional midblock median was estimated. The six such conversions were studied in this research. Safety analysis of u-turns conversions was done by using Before -After study and modeling of U-turns crashes with statistics methods. An Empirical Bayesian (EB) procedure was used to evaluate safety of u-turns conversions. In addition, the history of accidents was studied in both period of before and after treatment.
Author: Vaughan W. Inman
Publisher:
ISBN:
Category : Roads
Languages : en
Pages : 43
Get Book Here
Book Description
Four-lane divided highways are an economical design solution to increase the capacity of rural highways compared to grade-separated limited access facilities. Compared to two-lane undivided rural highways, four-lane divided highways have markedly lower rates of sideswipe, rear-end, and head-on collisions. However, right-angle crash rates are markedly higher on four-lane divided highway intersections than at two-lane undivided highway intersections, largely as a result of left-turn and through movements from minor roads conflicting with far-side vehicles on the divided highway. The restricted crossing U-turn (RCUT) intersection is a promising treatment to mitigate right-angle crashes where two-lane minor roads intersect with rural four-lane divided highways. This report includes a comparison of operations at an RCUT intersection in Maryland with a roughly comparable conventional stop-controlled intersection on the same corridor. It also includes before-after crash analyses for intersections converted from conventional to RCUT designs on two Maryland highway corridors. The operational analysis found that conflicts between vehicles entering or crossing the highway from a minor road were reduced, weaving movements were about the same for the two intersection types, the RCUT design added about 1 min to travel time for vehicles making left-turn or through movements from the minor road. Three approaches were used to estimate the affect of an RCUT conversion on crashes. All three approaches led to the same conclusion: the RCUT design reduces crashes. A simple 3-year before and 3-year after analysis suggested a 30 percent decrease in the average number of crashes per year. An analysis that adjusted the observed crash rate at RCUT locations for the observed crash rate at nearby conventional intersections on the same corridors suggested a 28 percent decrease in the average annual number of crashes. An empirical Bayes analysis that adjusts for, among other things, the expected number of crashes at similar intersections and average annual traffic suggested a 44 percent decrease in crashes. Furthermore, the analyses suggest an overall reduction in crash severity with the RCUT design.
Author: Vaughan W. Inman
Publisher:
ISBN:
Category : Roads
Languages : en
Pages : 0
Get Book Here
Book Description
Four-lane divided highways are an economical design solution to increase the capacity of rural highways compared to grade-separated limited access facilities. Compared to two-lane undivided rural highways, four-lane divided highways have markedly lower rates of sideswipe, rear-end, and head-on collisions. However, right-angle crash rates are markedly higher on four-lane divided highway intersections than at two-lane undivided highway intersections, largely as a result of left-turn and through movements from minor roads conflicting with far-side vehicles on the divided highway. The restricted crossing U-turn (RCUT) intersection is a promising treatment to mitigate right-angle crashes where two-lane minor roads intersect with rural four-lane divided highways. This report includes a comparison of operations at an RCUT intersection in Maryland with a roughly comparable conventional stop-controlled intersection on the same corridor. It also includes before-after crash analyses for intersections converted from conventional to RCUT designs on two Maryland highway corridors. The operational analysis found that conflicts between vehicles entering or crossing the highway from a minor road were reduced, weaving movements were about the same for the two intersection types, the RCUT design added about 1 min to travel time for vehicles making left-turn or through movements from the minor road. Three approaches were used to estimate the affect of an RCUT conversion on crashes. All three approaches led to the same conclusion: the RCUT design reduces crashes. A simple 3-year before and 3-year after analysis suggested a 30 percent decrease in the average number of crashes per year. An analysis that adjusted the observed crash rate at RCUT locations for the observed crash rate at nearby conventional intersections on the same corridors suggested a 28 percent decrease in the average annual number of crashes. An empirical Bayes analysis that adjusts for, among other things, the expected number of crashes at similar intersections and average annual traffic suggested a 44 percent decrease in crashes. Furthermore, the analyses suggest an overall reduction in crash severity with the RCUT design.
Author: Jerome S. Gluck
Publisher: Transportation Research Board
ISBN: 9780309063128
Category : Technology & Engineering
Languages : en
Pages : 168
Get Book Here
Book Description
Author:
Publisher:
ISBN:
Category : Roads
Languages : en
Pages : 4
Get Book Here
Book Description
Author: Ezra Hauer
Publisher:
ISBN:
Category :
Languages : en
Pages : 305
Get Book Here
Book Description
Author:
Publisher:
ISBN:
Category : Roads
Languages : en
Pages : 217
Get Book Here
Book Description
Florida State University researchers developed guidance to assist planners in deciding where to place restricted crossing U-turns (RCUTs).
Author: Lee August Rodegerdts
Publisher: Transportation Research Board
ISBN: 0309155118
Category : Technology & Engineering
Languages : en
Pages : 407
Get Book Here
Book Description
TRB's National Cooperative Highway Research Program (NCHRP) Report 672: Roundabouts: An Informational Guide - Second Edition explores the planning, design, construction, maintenance, and operation of roundabouts. The report also addresses issues that may be useful in helping to explain the trade-offs associated with roundabouts. This report updates the U.S. Federal Highway Administration's Roundabouts: An Informational Guide, based on experience gained in the United States since that guide was published in 2000.
