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Author: Edgar de León Izeppi
Publisher:
ISBN:
Category : Friction--Measurement
Languages : en
Pages : 99
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Book Description
A pavement friction management program (PFMP) should involve both equipment to collect friction and other relevant data as well as processes to analyze friction and crash data to determine possible friction enhancement treatments on sections that warrant it. This project built on previous experience with PFMPs to (1) propose an enhanced methodology for systematically screening a highway network and identifying sections that may warrant a detailed safety investigation and (2) demonstrate that methodology on the Corridors of Statewide Significance (CoSS) in Virginia. This project evaluated 7,000 miles of highway in Virginia. The demonstration collected friction, macrotexture, and geometric data; processed and filtered the data; and conducted a systemic analysis of the network. The analysis investigated the relationship between crashes and friction and other roadway properties, and developed Safety Performance Functions (SPFs) to quantify this relationship. The SPFs were then used in empirical Bayes analyses to estimate crash counts before and after friction enhancement treatment and identify sections with friction deficiencies that may benefit from them. The network-level screening identified 1,709 0.1-mile sections of roadway that can benefit from a friction enhancement treatment and thus may require a detailed safety investigation. The application of the selected friction enhancement treatment to the sections could result in a reduction of up 12,949 crashes (approximately 20% of crashes observed over 3 years) in the network analyzed. The friction enhancement treatments would cost about 4 2 million dollars but could generate potential economic savings over 1 .75 billion dollars. The network-level assessment of the CoSS demonstrated the benefits and practicality of adopting a proactive, systemic pavement friction management approach to screen for sections that may benefit from friction enhancement treatment and warrant a detailed section investigation. The results of the demonstration suggest that the statewide adoption of the methodology can help reduce a significant number of crashes and associated fatalities and injuries. The project surveyed a significant portion of the CoSS, screened the network, and identified many sections in which friction enhancement treatment could result in high potential return on investment. Each district can utilize the data collected in the project to target their detailed safety analyses and design safety improvement projects with collaboration from the Traffic Engineering, Maintenance, and Materials Divisions.
Author: Edgar de León Izeppi
Publisher:
ISBN:
Category : Friction--Measurement
Languages : en
Pages : 99
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Book Description
A pavement friction management program (PFMP) should involve both equipment to collect friction and other relevant data as well as processes to analyze friction and crash data to determine possible friction enhancement treatments on sections that warrant it. This project built on previous experience with PFMPs to (1) propose an enhanced methodology for systematically screening a highway network and identifying sections that may warrant a detailed safety investigation and (2) demonstrate that methodology on the Corridors of Statewide Significance (CoSS) in Virginia. This project evaluated 7,000 miles of highway in Virginia. The demonstration collected friction, macrotexture, and geometric data; processed and filtered the data; and conducted a systemic analysis of the network. The analysis investigated the relationship between crashes and friction and other roadway properties, and developed Safety Performance Functions (SPFs) to quantify this relationship. The SPFs were then used in empirical Bayes analyses to estimate crash counts before and after friction enhancement treatment and identify sections with friction deficiencies that may benefit from them. The network-level screening identified 1,709 0.1-mile sections of roadway that can benefit from a friction enhancement treatment and thus may require a detailed safety investigation. The application of the selected friction enhancement treatment to the sections could result in a reduction of up 12,949 crashes (approximately 20% of crashes observed over 3 years) in the network analyzed. The friction enhancement treatments would cost about 4 2 million dollars but could generate potential economic savings over 1 .75 billion dollars. The network-level assessment of the CoSS demonstrated the benefits and practicality of adopting a proactive, systemic pavement friction management approach to screen for sections that may benefit from friction enhancement treatment and warrant a detailed section investigation. The results of the demonstration suggest that the statewide adoption of the methodology can help reduce a significant number of crashes and associated fatalities and injuries. The project surveyed a significant portion of the CoSS, screened the network, and identified many sections in which friction enhancement treatment could result in high potential return on investment. Each district can utilize the data collected in the project to target their detailed safety analyses and design safety improvement projects with collaboration from the Traffic Engineering, Maintenance, and Materials Divisions.
Author:
Publisher: AASHTO
ISBN: 1560514280
Category : Pavements
Languages : en
Pages : 87
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Book Description
This report contains guidelines and recommendations for managing and designing for friction on highway pavements. The contents of this report will be of interest to highway materials, construction, pavement management, safety, design, and research engineers, as well as others concerned with the friction and related surface characteristics of highway pavements.
Author: American Association of State Highway and Transportation Officials
Publisher:
ISBN: 9781560517986
Category : Pavements
Languages : en
Pages : 0
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Book Description
"This guide contains recommendations and guidelines for managing and designing highway pavements for friction. It is designed for use by highway materials, construction, pavement management, safety, design, and research engineers, as well as others concerned with the friction and related surface characteristics of highway pavements. This second edition has been updated to include information on friction testing and safety, including how the risk for both wet and dry crashes increases as pavement friction decreases. This consideration between friction and all crashes is consistent with proactive and systemic approaches to improving safety performance across the roadway network, based on measurable risk and performance characteristics that are part of the Safe Systems approach. The recommendations for pavement friction management programs were also updated to reflect the most current safety concepts, and additional information on alternative friction testing equipment has been added."--Publisher website
Author: John Jewett Henry
Publisher: Transportation Research Board
ISBN: 9780309068741
Category : Technology & Engineering
Languages : en
Pages : 76
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Book Description
This synthesis report will be of interest to pavement design, construction, management, and research engineers, highway safety officials, and others concerned with pavement friction characteristics. It describes the current state of the practice and discusses the methods used for evaluating wet pavement friction characteristics of new and restored pavements. This synthesis reviews models used for measuring and evaluating friction and texture, causes for friction changes over time, and aggregate and mix design to provide adequate friction. Also presented are construction and surface restoration practices for providing good pavement surface characteristics. In addition, considerations of noise and ride quality are discussed when compromise may be required.
Author: John W. Henault
Publisher:
ISBN:
Category : Pavements
Languages : en
Pages : 76
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Book Description
Author: Shuo Li
Publisher: Purdue University Press
ISBN: 9781622600229
Category :
Languages : en
Pages : 52
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Book Description
The implementation of a pavement preservation program involves a learning curve with not only a determination to succeed, but also the courage to fail. Also, successful implementation of pavement preservation program requires knowledge of the performance of preservation surface treatments over time, which is critical to the select of candidate projects and the development of performance models for pavement management analysis. In addition, preservation surface treatments, such as chip seal, fog seal, microsurfacing, 4.75 mm thin or ultra-thin overlay, can not only repair certain pavement surface defects, but also change the surface characteristics of pavement and therefore affect pavement surface friction performance. Nevertheless, such information is currently not available but is essential for the Indiana Department of Transportation (INDOT) to evaluate the effectiveness of pavement preservation surface treatments. As a concentrated effort, this study focused on the long-term friction performance of preservation surface treatments, particularly those have been widely used and those have seen increasing use by INDOT. Based on the selected field pavement test sections, this study aimed to evaluate the surface characteristics, particularly the long-term friction performance for those surface treatments that have been widely used and have seen increasing use by INDOT, including chip seal, fog-chip, fog seal, rejuvenating seal, microsurfacing, ultrathin bonded wearing course (UBWC), 4.75-mm hot mix asphalt (HMA) thin overlay, and profile milling (or diamond grinding). The test sections for each type of surface treatment covered a wide range of traffic volume from light to high. The service life for the selected test sections varied from 6 months to 60 months. Friction testing was mainly conducted using ASTM E 274 locked wheel trailer. Surface texture testing was conducted using either the ASTM E 2157 circular track meter (CTM) or a laser scanner. Pavement roughness and noise tests were also conducted to address the smoothness and noise issues, particularly on microsurfacing. Detailed analysis was provided to evaluate the friction performance of 4.75-mm HMA overlays. It is believed that the test results and findings drawn from this study not only provides timely information for INDOT to improve its pavement preservation program, but also provides the original information for the potential readers to better utilize preservation surface treatments.
Author: Ken Skorseth
Publisher:
ISBN:
Category : Gravel roads
Languages : en
Pages : 112
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Book Description
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.
Author: Wisconsin. Division of Highways
Publisher:
ISBN:
Category : Pavements
Languages : en
Pages : 13
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Book Description
Author: D. C. Mahone
Publisher:
ISBN:
Category : Friction
Languages : en
Pages : 50
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Book Description
Author:
Publisher:
ISBN:
Category : Friction
Languages : en
Pages : 4
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Book Description
"This digest summarizes the findings from NCHRP Project 1-43, "Guide for pavement friction." It was prepared by Amir N. Hanna, NCHRP Senior Program Officer, ... J. W. Hall served as principal investigator."
