Author: Warren E. Hughes
Publisher:
ISBN:
Category : Quantitative research
Languages : en
Pages : 112
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This report presents the results of a study of reported crashes that occurred in selected work zones from four participating States: California, Maryland, Minnesota, and Washington. Candidate construction projects were identified by the State Transportation Agencies. Data on the location of the project, the start and end dates, the type of project, the type of highway, and other factors were compiled for each project. In addition, data on the work zone was also gathered. Crashes reported when the work zone was in effect and for the corresponding period before the construction project were identified and crash data were obtained. Analyses were undertaken to determine differences in crash rates during construction compared to before construction. The relative increase in rates was on the order of 25 to 50 percent for many of the projects and as much as 100 percent for some of the projects. In addition, an assessment of data elements for work zones and work zone crashes was conducted. Recommendations on a standardized definition for work zones and work zone crashes are proposed.
Author: Jerry L. Graham
Publisher:
ISBN:
Category : Roads
Languages : en
Pages : 104
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Book Description
The study involves the development of an accident data reporting process for use in construction, maintenance, or utility work areas. The process is based on the results of a 9 state survey which collected information on practices and procedures which were in use in those states.
Author: Young-Jun Kweon
Publisher:
ISBN:
Category : Road work zones
Languages : en
Pages : 0
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Book Description
The Virginia Department of Transportation (VDOT) is interested in refining work zone safety performance measures so that safety can be better assessed, monitored, and compared over time. VDOT currently uses the number of fatalities and the number of serious injuries in work zone traffic crashes as statewide performance measures. Although these are important direct safety metrics, they do not reflect differences in work zone exposure measures, such as the number of work zones. As a result, it is not always clear whether changes in work zone crashes are being caused by safety problems or changes in the amount of road work. This study developed and improved statewide work zone safety performance measures for Virginia by combining information from two sources in VDOT: the VDOT crash database containing information in police crash reports and the Virginia Traffic Information Management System (VaTraffic) database containing information on incidents, work zones, weather conditions, etc. Count measures, such as the number of fatal work zone crashes, were calculated from the crash database. Exposure measures, such as work zone-hours, were calculated from the VaTraffic database. Combining these two types of measures resulted in rate measures such as number of fatal work zone crashes per 1,000 work zone-hours. Unfortunately, existing databases still have a number of limitations that prohibit the calculation of ideal rate-based performance measures. Based on currently available data, four performance measures were found to be appropriate for monitoring and evaluating the statewide safety performance of work zones, and eight summary measures were identified in order to obtain further insights regarding statewide safety issues at work zones in Virginia. These measures were selected using the results of statistical analyses and input from a technical review panel consisting of work zone coordinators and traffic engineers. An important finding of this study was that work zone safety assessments can change significantly depending on whether exposure measures are included. Based on count measures, work zones on non-interstate highways appear to have safety records equal to or better than those on interstate highways. However, when exposure measures were incorporated, work zones on interstate highways were shown to have better safety records. This study recommends that VDOT immediately begin using the performance measures identified in this study.
Author:
Publisher:
ISBN:
Category : Road construction workers
Languages : en
Pages : 108
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Book Description
Author: Kerrie L. Schattler
Publisher:
ISBN:
Category :
Languages : en
Pages : 129
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Author: Ishani Madurangi Dias
Publisher:
ISBN:
Category : Roads
Languages : en
Pages : 123
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Book Description
"The safe and efficient flow of traffic through work zones must be established by improving work zone conditions. Therefore, identifying the factors associated with the severity and the frequency of work zone crashes is important. According to current statistics from the Federal Highway Administration, 2,372 fatalities were associated with motor vehicle traffic crashes in work zones in the United States during the four years from 2010 to 2013. From 2002 to 2014, an average of 1,612 work zone crashes occurred in Kansas each year, making it a serious concern in Kansas. The objectives of this study were to analyze work zone crash characteristics, identify the factors associated with crash severity and frequency, and to identify recommendations to improve work zone safety. Work zone crashes in Kansas from 2010 to 2013 were used to develop crash severity models. Ordered probit regression was used to model the crash severities for daytime, nighttime, multi-vehicle and single-vehicle work zone crashes and for work zones crashes in general. Based on severity models, drivers from 26 to 65 years of age were associated with high crash severities during daytime work zone crashes and driver age was not found significant in nighttime work zone crashes. The use of safety equipment was related to reduced crash severities regardless of the time of the crash. Negative binomial regression was used to model the work zone crash frequency using work zones functioned in Kansas in 2013 and 2014. According to results, increased average daily traffic (AADT) was related to higher number of work zone crashes and work zones in operation at nighttime were related to a reduced number of work zone crashes. Findings of this study were used to provide general countermeasure ideas for improving safety of work zones" (page ii).
Author:
Publisher: Transportation Research Board
ISBN: 0309117437
Category : Roads
Languages : en
Pages : 107
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Author:
Publisher:
ISBN:
Category : Road construction
Languages : en
Pages : 96
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Book Description
The work zone accident data process is a data collection and processing procedure which starts at the construction and maintenance work site and transmits information through the regular communications channels to the state highway agency headquarters. The process is a supplement to regular police accident reporting and is used to provide a supplement to regular police accident reporting as well as long range summaries (statewide application).
Author: Nicholas J. Garber
Publisher:
ISBN:
Category : Road work zones
Languages : en
Pages : 44
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Book Description
Work zones tend to cause hazardous conditions for drivers and construction workers since they generate conflicts between construction activities and traffic. A clear understanding of the characteristics of work zone crashes will enhance the selection of the appropriate measures that can minimize the negative impacts of work zones. This study investigated the characteristics of work zone crashes that occurred in Virginia between 1996 and 1999. The information on each crash was obtained from the police crash record. The location of each crash was categorized as being in one of the five areas of a typical work zone: advance warning area, transition area, longitudinal buffer area, activity area, and termination area. An analysis of the percentage distributions was then carried out with respect to area in work zone, severity, type of collision, and type of highway. The proportionality test was used to determine significant differences at the 5 percent significance level. Selected crash characteristics, such as the proportions of single- and multi-vehicle crashes, were compared for work zone and non-work zone crashes. The results indicated that the activity area was the predominant location for work zone crashes regardless of highway type and that rear-end crashes were the predominant type of crash. The results also indicated that the proportion of sideswipe same direction crashes in the transition area was significantly higher than in the advance warning area and that work zone crashes involved a higher proportion of multi-vehicle crashes and fatal crashes than did non-work zone crashes.
Author: United States. National Transportation Safety Board
Publisher:
ISBN:
Category : Roads
Languages : en
Pages : 88
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