Author: Publisher:
ISBN:
Category : Left-turn lanes
Languages : en
Pages : 224
Book Description
Effects of Increased U-turns at Intersections on Divided Facilities and Median Divided Versus Five-lane Undivided Benefits
Author: Safety of U-turns at Unsignalized Median Openings
Author: Ingrid B. PottsPublisher: Transportation Research Board
ISBN: 0309088054
Category : Median strips
Languages : en
Pages : 142
Book Description
"TRB's National Cooperative Highway Research Program (NCHRP) Report 524: Safety of U-Turns at Unsignalized Median Openings includes recommended guidelines for locating and designing unsignalized median openings, and a methodology for comparing the relative safety performance of different designs"--Publisher's description.
Safety and Operational Characteristics of Two-way Left-turn Lanes
Author: Vijay TaladaPublisher:
ISBN:
Category : Left-turn lanes
Languages : en
Pages : 384
Book Description
The purpose of this research was to evaluate the safety and operational characteristics of two-way left-turn lanes (TWLTLs) compared to four-lane undivided roadways in Minnesota. Research tasks to achieve this purpose consisted of a comprehensive literature review, data collection from the identified study sites, and statistical data analysis. Nine study sites were selected, located throughout the state of Minnesota. Operational and crash data were analyzed before and after the conversion from a four-lane undivided roadway to a three-lane roadway with a TWLTL. The results of a yoked/group comparison analysis showed statistically significant reductions in total crashes, PDO crashes and left turn crashes. The percentage reductions in total crashes, PDO crashes and left turn crashes after the conversion were approximately 37 percent, 46 percent and 24 percent, respectively. The reductions in crash rates for total crashes and PDO crashes were found statistically significant and the percentage reductions were 46 percent and 45 percent, respectively. Additionally, the change in the mean speed and 85th percentile speed were found statistically significant, but in both cases the change was less than two miles per hour. The results of this research show that safety characteristics of a roadway are improved when a four-lane undivided roadway is converted to a three-lane roadway with a TWLTL when daily traffic volumes are less than 17,500 vehicles per day.
Effective Utilization of Street Width on Urban Arterials
Author: Douglas W. HarwoodPublisher: Transportation Research Board
ISBN: 9780309048538
Category : Technology & Engineering
Languages : en
Pages : 60
Book Description
Operational Impacts of Median Width on Larger Vehicles
Author: Douglas W. HarwoodPublisher: Transportation Research Board
ISBN: 9780309068659
Category : Transportation
Languages : en
Pages : 80
Book Description
This synthesis report will be of interest to officials and staff of municipal, regional, and statewide transportation agencies responsible for roadway design and traffic control. It will be of special interest to those concerned with intersections and driveways on divided highways where larger vehicles encounter narrow medians. It will also be of interest to other professionals who interact with these agencies to mitigate such problems. This report presents state-of-the-practice information about current median design policies and practices, describes the traffic operational and safety problems encountered in designing for larger vehicles at divided highway intersections, and identifies alternative improvement techniques that can be used in new construction or reconstruction projects to avoid introducing traffic operational and safety problems. This TRB report focuses on 10 alternative cross sections widely used on arterial highways in urban, suburban, and rural environment.
Transportation Research Record
Author: NCHRP Report 524
Author: Partnerships for Effective Technology Transfer
Author: Publisher:
ISBN:
Category : Diffusion of innovations
Languages : en
Pages : 1052
Book Description
Report
Author: Access Management Manual
Author: Kristine WilliamsPublisher:
ISBN: 9780309295413
Category : Roads
Languages : en
Pages : 529
Book Description
"Since the publication of the first edition of the Access Management Manual, the context for transportation planning and roadway design in the United States has been transformed. Transportation agencies and local governments are under growing pressure to integrate land use and transportation policy and achieve a more sustainable, energy-efficient transportation system. This second edition of the manual responds to these developments by addressing access management comprehensively, as a critical part of network and land use planning. The content is interdisciplinary, with guidance pertinent to various levels of government as well as to pedestrians, bicyclists, and motorized vehicles, including trucks and buses, and is strongly grounded in decades of research, engineering science, and professional experience. Greater emphasis is placed on appropriate location of access, and guidance is refined to provide appropriate consideration of context and community issues. Substantial updates aid state and local agencies in managing access to corridor development effectively. Specific guidance on network and circulation planning and modal considerations is included, as well as guidance on effective site access and circulation design. A chapter on corridor management reinforces these concepts with a framework for application of access management in different contexts, along with appropriate strategies for each context. There are also new chapters on network planning, regional access management policies and programs, interchange area access management, auxiliary lane warrants and design, and right-of-way and access control. The manual concludes with an extensive menu of access management techniques and information on their application"--Provided by publisher.