Construction Zone Safety and Delineation Study PDF Download
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Author: Thomas D. Davis
Publisher:
ISBN:
Category : Road markings
Languages : en
Pages : 144
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Book Description
Author: Thomas D. Davis
Publisher:
ISBN:
Category : Road markings
Languages : en
Pages : 144
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Book Description
Author: Thomas D. Davis
Publisher:
ISBN:
Category : Reflectors (Safety devices)
Languages : en
Pages : 28
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Author: Thomas D. Davis
Publisher:
ISBN:
Category : Reflectors (Safety devices)
Languages : en
Pages : 82
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Book Description
Author: Henry Brown
Publisher:
ISBN:
Category : Road work zones
Languages : en
Pages : 136
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Book Description
The Highway Safety Manual (HSM) is the compilation of national safety research that provides quantitative methods for analyzing highway safety. The HSM presents crash modification functions related to freeway work zone characteristics such as work zone duration and length. These crash modification functions were based on freeway work zones with high traffic volumes in California. When the HSM-referenced model was calibrated for Missouri, the value was 3.78, which is not ideal since it is significantly larger than 1. Therefore, new models were developed in this study using Missouri data to capture geographical, driver behavior, and other factors in the Midwest. Also, new models for expressway and rural two-lane work zones that barely were studied in the literature were developed. A large sample of 20,837 freeway, 8,993 expressway, and 64,476 rural two-lane work zones in Missouri was analyzed to derive 15 work zone crash prediction models. The most appropriate samples of 1,546 freeway, 1,189 expressway, and 6,095 rural two-lane work zones longer than 0.1 mile and with a duration of greater than 10 days were used to make eight, four, and three models, respectively. A challenging question for practitioners is always how to use crash prediction models to make the best estimation of work zone crash count. To solve this problem, a user-friendly software tool was developed in a spreadsheet format to predict work zone crashes based on work zone characteristics. This software selects the best model, estimates the work zone crashes by severity, and converts them to monetary values using standard crash estimates. This study also included a survey of departments of transportation (DOTs), Federal Highway Administration (FHWA) representatives, and contractors to assess the current state of the practice regarding work zone safety. The survey results indicate that many agencies look at work zone safety informally using engineering judgment. Respondents indicated that they would like a tool that could help them to balance work zone safety across projects by looking at crashes and user costs.
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 838
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Book Description
Author: United States. General Accounting Office
Publisher:
ISBN:
Category : Roads
Languages : en
Pages : 44
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Book Description
Oversight of the Federal Highway Administration in providing sufficient leadership in emphasizing safety in construction zones.
Author:
Publisher:
ISBN:
Category : Highway engineering
Languages : en
Pages : 688
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Book Description
Author: Kenneth S. Opiela
Publisher:
ISBN:
Category : Automobile drivers
Languages : en
Pages : 112
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Book Description
This report describes a study of the delineation requirements for work zone traffic control. The research included a comprehensive review of past studies and current practices, and an examination of current standards. It was concluded that, in spite of the increasing number of different types of channelizing devices, there appears to be no scientific basis for the spacing criteria for the use of devices for channelization purposes in the taper or tangent sections of a work zone. A laboratory-based testing procedure was used to determine the most appropriate spacing configuration. An interactive video system was used to test subject recognition distances of eight different device types spaced at the standard distance, 1.5 times and 2.0 times the standard distance. Over 240 subjects were tested.
Author: Frank D. Shepard
Publisher:
ISBN:
Category : Road markings
Languages : en
Pages : 34
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Book Description
The purpose of this study was to investigate vehicle guidance through work zones by evaluating the effectiveness of two primary components of traffic control relative to delineation. First, a comparison of the steady-burn lights presently used on top of the temporary concrete barriers was made with experimental reflectorized panels. Second, the addition of closely spaced raised pavement markers as a supplement to the existing pavement markings was evaluated. The study was limited to work zones on interstates and four-lane highways. The results of this investigation have led to the recommendation that (1) steady-burn lights on temporary concrete barricades should be replaced with reflectorized panels fabricated with high intensity sheeting, and (2) closely spaced, raised pavement markers should be used as a supplement to existing pavement striping in areas where the roadway alignment changes.
Author: Errol C. Noel
Publisher:
ISBN:
Category : Roads
Languages : en
Pages : 48
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Book Description
