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"[This report] is a handbook to help reduce the risk of wrong-way driving crashes. The handbook was developed on the basis of a systematic literature review, collection and analysis of wrong-way driving incident and crash data, and evaluation of a range of relevant traffic control devices and other technologies. The handbook provides evidence-based information to support implementation of traffic control devices, advanced technologies, geometric design features, and education and enforcement strategies to significantly reduce the number of wrong-way driving incidents and crashes on freeways and divided highways. This handbook will be of interest to state departments of transportation and other stakeholders concerned with reducing the number of wrong-way driving incidents and crashes that occur on freeways and divided highways." -- foreword
There are many strategies and treatments that agencies can consider for implementation to address wrong-way driving maneuvers, ranging from conventional traffic control devices to specialized geometric design elements and various intelligent transportation systems-based solutions. NCHRP Web-Only Document 357: Wrong-Way Driving Solutions, Policy, and Guidelines, from TRB's National Cooperative Highway Research Program, is supplemental to NCHRP Research Report 1050: Wrong-Way Driving Solutions Handbook.
This book looks at one of the most serious types of highway accidentscollisions involving vehicles traveling the wrong way on high-speed divided highways. The goal of this investigative project is to identify relevant safety recommendations to prevent wrong-way collisions on such highways and access ramps. The investigations included in the book take a focused view of the driver and highway issues affecting wrong-way collisions. The book addresses the following safety issues concerning wrong-way driving: driver impairment, primarily from alcohol use, with consideration of older driver issues and possible drug involvement; the need to establish, through traffic control devices and highway design, distinctly different views for motorists approaching entrance and exit ramps; monitoring and intervention programs for wrong-way collisions; and in-vehicle driver support systems.
Senate bill 233 (Davis 1987) required a current study on the wrong-way problem on freeways. This report discusses solutions developed over the years to prevent wrong-way driving by Caltrans, results of recent camera surveillance studies and the current annual wrong-way monitoring program. To determine if other states had developed any new solutions to the problem, traffic engineers from all the states were surveyed. The recommendations to prevent wrong-way accidents are in the areas of sign maintenance, annual accident monitoring using a check-list process, ramp and intersection design, and reducing drunk drivers. It also recommends the purchase of new still camera, video, or movie camera and detector equipment, and continuing the pavement light experiment in San Diego.
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.
Wrong-way driving (WWD) has been problematic on United States highways for decades despite its rare occurrence. Since WWD crashes are rare, recent researchers have studied WWD non-crash events such as WWD 911 calls and WWD citations to understand the overall nature and trend of WWD. This paper demonstrates the regional nature of the WWD problem and proposes regional transportation systems management and operations (Regional TSM&O) solutions to combat this problem. Specifically, it was found that 11% of all WWD multi-data events (e.g., multiple 911 calls for the same WWD event) traveled from one county to another. Additionally, 30% of all WWD single-data and multi-data events occurred at or near interchanges between two limited access highways in counties with multiple operating agencies. This indicates that a significant proportion of WWD events could potentially travel from one limited access facility to another. Moreover, 28% of WWD events occurred on limited access facilities shared by multiple agencies. To emphasize the regional nature of WWD, this paper determined the vulnerable demographic groups in different regions of Florida by developing WWD crash and citation prediction models. The models' findings indicate that certain demographic groups (such as elderly or Hispanic) increase WWD risk. The models' results can be used to improve driver education and increase law enforcement presence in high risk WWD locations. Regional TSM&O solutions, such as coordination and communication among agencies and regional traffic management centers (RTMCs), law enforcement co-location with RTMCs, and strengthening statewide TSM&O programs to manage WWD events are also proposed.
The purpose of this manual is to provide clear and helpful information for maintaining gravel roads. Very little technical help is available to small agencies that are responsible for managing these roads. Gravel road maintenance has traditionally been "more of an art than a science" and very few formal standards exist. This manual contains guidelines to help answer the questions that arise concerning gravel road maintenance such as: What is enough surface crown? What is too much? What causes corrugation? The information is as nontechnical as possible without sacrificing clear guidelines and instructions on how to do the job right.
Context-sensitive solutions (CSS) reflect the need to consider highway projects as more than just transportation facilities. Depending on how highway projects are integrated into the community, they can have far-reaching impacts beyond their traffic or transportation function. CSS is a comprehensive process that brings stakeholders together in a positive, proactive environment to develop projects that not only meet transportation needs, but also improve or enhance the community. Achieving a flexible, context-sensitive design solution requires designers to fully understand the reasons behind the processes, design values, and design procedures that are used. This AASHTO Guide shows highway designers how to think flexibly, how to recognize the many choices and options they have, and how to arrive at the best solution for the particular situation or context. It also strives to emphasize that flexible design does not necessarily entail a fundamentally new design process, but that it can be integrated into the existing transportation culture. This publication represents a major step toward institutionalizing CSS into state transportation departments and other agencies charged with transportation project development.
The Florida Department of Transportation has studied wrong way crashes occurring on interestate freeways and expressways throughout the state of Florida. In the past five years (2009-2013), 280 crashes have occurred on Florida's freeways and expressways resulting in more than 400 injuries and 75 deaths. This study analyzed trends and contributing factors surrounding wrong way driving on freeways and expressways. It proposed systemic countermeasures to prevent or discourage wrong way occurrences, reducing wrong way crashes and driving down fatalities on Florida's freeways and expressways.