Development Of Zonal Safety Performance Functions For Local Road Intersections And Segments In Connecticut PDF Download

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Development of Zonal Safety Performance Functions for Local Road Intersections and Segments in Connecticut

Development of Zonal Safety Performance Functions for Local Road Intersections and Segments in Connecticut
Author: Ishraq Rayeed Ahmed
Publisher:
Total Pages:
Release: 2018
Genre: Electronic dissertations
ISBN:

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Crash counts at a location are predicted using a Safety Performance Function (SPF) equation. The expected number of crashes on a traffic facility can be estimated using SPFs and the required countermeasures can be taken to reduce crashes in future. Due to the absence of sufficient traffic count data for local roads, new crash prediction approaches are essential to implementing highway safety improvement strategies. The study focuses on developing SPFs with coefficients varying by geographic covariate for segment and intersection crashes on local roads in Connecticut. Demographic and network topology data has been used as a surrogate for traffic count data which are not available for these roads. Two clustering methods – K-Means and Latent Class Clustering (LCC) has been explored for classifying cases for varying coefficients. The variables that were used to classify into clusters were land cover, population density and employment density. The models clustered using LCC with total population, retail and non-retail employment and average household income as independent variables were found to be the best based on model fit and out of sample prediction.


Safety Performance Functions for Intersections

Safety Performance Functions for Intersections
Author:
Publisher:
Total Pages: 17
Release: 2009
Genre: Roads
ISBN:

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Road safety management activities include screening the network for sites with a potential for safety improvement (Network Screening), diagnosing safety problems at specific sites, and evaluating the safety effectiveness of implemented countermeasures. It is important that these activities be both efficient and methodologically sound, since resources would otherwise be wasted on unnecessary treatments for safe elements and elements deserving of treatment would be left untreated. The state-of-the-art methodologies for conducting these activities make use of statistical models to predict expected accident frequencies using traffic volumes and other site characteristics as the input to the models (known as Safety Performance Functions or SPFs). CDOT's research and safety engineers are in the forefront of national efforts to develop methods using SPFs to screen large networks to find sites with a potential for safety improvement. CDOT has previously developed SPFs to identify freeway and rural roadway segments that have the potential for accident reduction. This report documents the data collection, modeling efforts, and findings of a research project to develop SPFs for ten categories of intersections.


Median Cross-section Design for Rural Divided Highways

Median Cross-section Design for Rural Divided Highways
Author: Jerry L. Graham (Verkehrsingenieur.)
Publisher:
Total Pages: 110
Release: 2014
Genre: Express highways
ISBN: 9780309308199

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"TRB's National Cooperative Highway Research Program (NCHRP) Report 794: Median Cross-Section Design for Rural Divided Highways provides guidelines for designing typical cross-sections for medians on new and existing rural freeways and divided highways."--Publisher's description.


Pedestrian Facilities Users Guide: Providing Safety and Mobility

Pedestrian Facilities Users Guide: Providing Safety and Mobility
Author: Charles V. Zegeer
Publisher: DIANE Publishing
Total Pages: 164
Release: 2002
Genre: Pedestrian accidents
ISBN: 1428995501

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This guide is intended to provide information on how to identify safety and mobility needs for pedestrians with the roadway right-of-way. Useful for engineers, planners, safety professionals and decision-makers, the guide covers such topics as: the Walking Environment including sidewalks, curb ramps, crosswalks, roadway lighting and pedestrian over and under passes; Roadway Design including bicycle lanes, roadway narrowing, reducing the number of lanes, one-way/two-way streets, right-turn slip lanes and raised medians; Intersections with roundabouts, T-intersections and median barriers; and Traffic calming designs.


Roadside Design Guide

Roadside Design Guide
Author: American Association of State Highway and Transportation Officials. Task Force for Roadside Safety
Publisher:
Total Pages: 560
Release: 1989
Genre: Roads
ISBN:

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Traffic Engineering Handbook

Traffic Engineering Handbook
Author: ITE (Institute of Transportation Engineers)
Publisher: John Wiley & Sons
Total Pages: 688
Release: 2016-01-26
Genre: Technology & Engineering
ISBN: 1118762304

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Get a complete look into modern traffic engineering solutions Traffic Engineering Handbook, Seventh Edition is a newly revised text that builds upon the reputation as the go-to source of essential traffic engineering solutions that this book has maintained for the past 70 years. The updated content reflects changes in key industry standards, and shines a spotlight on the needs of all users, the design of context-sensitive roadways, and the development of more sustainable transportation solutions. Additionally, this resource features a new organizational structure that promotes a more functionally-driven, multimodal approach to planning, designing, and implementing transportation solutions. A branch of civil engineering, traffic engineering concerns the safe and efficient movement of people and goods along roadways. Traffic flow, road geometry, sidewalks, crosswalks, cycle facilities, shared lane markings, traffic signs, traffic lights, and more—all of these elements must be considered when designing public and private sector transportation solutions. Explore the fundamental concepts of traffic engineering as they relate to operation, design, and management Access updated content that reflects changes in key industry-leading resources, such as the Highway Capacity Manual (HCM), Manual on Uniform Traffic Control Devices (MUTCD), AASSHTO Policy on Geometric Design, Highway Safety Manual (HSM), and Americans with Disabilities Act Understand the current state of the traffic engineering field Leverage revised information that homes in on the key topics most relevant to traffic engineering in today's world, such as context-sensitive roadways and sustainable transportation solutions Traffic Engineering Handbook, Seventh Edition is an essential text for public and private sector transportation practitioners, transportation decision makers, public officials, and even upper-level undergraduate and graduate students who are studying transportation engineering.


The Handbook of Road Safety Measures

The Handbook of Road Safety Measures
Author: Rune Elvik
Publisher: Emerald Group Publishing
Total Pages: 1137
Release: 2009-10-14
Genre: Transportation
ISBN: 1848552505

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Contains summaries of the knowledge regarding the effects of 128 road safety measures. This title covers various areas of road safety including: traffic control; vehicle inspection; driver training; publicity campaigns; police enforcement; and, general policy instruments. It also covers topics such as post-accident care, and speed cameras.


Access Management on Crossroads in the Vicinity of Interchanges

Access Management on Crossroads in the Vicinity of Interchanges
Author: Marc A. Butorac
Publisher: Transportation Research Board
Total Pages: 92
Release: 2004
Genre: Roads
ISBN: 0309070090

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TRB's National Cooperative Highway Research Program (NCHRP) Synthesis 332: Access Management on Crossroads in the Vicinity of Interchanges examines current practices relating to access location and design on crossroads in the vicinity of interchanges. It identifies standards and strategies used on new interchanges and on the retrofit of existing interchanges.