Author: Jonathan Everett Upchurch
Publisher:
ISBN:
Category : Roads
Languages : en
Pages : 108
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Book Description
The study objective was to identify a lighting system which has a lower power cost and reduced maintenance requirements and which provides adequately for motorists' needs in terms of legibility and illumination level. Twenty-five candidate lighting systems were identified through a review of technical data and specifications for lamps and fixtures by an independent lighting expert. Photometric tests and computer analyses of sign illumination levels reduced the number of candidates to ten alternative systems which were then field tested. Each alternative lighting system was tested for 10 to 14 months. Sign luminance was measured with a telephotometer. Power consumption was monitored. Maintenance requirements and lamp life were noted. A human factors study determined legibility distance and rated viewing comfort, lighting uniformity, and color rendition. An economic analysis was performed which considered the initial cost of acquiring and installing the lighting systems and annual costs for electric power, washing, relamping, and ballast replacement. A lighting system using the high pressure sodium light source was recommended. Compared to the existing commonly used fluorescent system, it uses one-third as much electric power and has about one-third of the annual owning and operating cost. The recommended system has a satisfactory illumination level and provides the best legibility distance of the ten systems tested.
Author: Hugh W. McGee
Publisher: Transportation Research Board
ISBN: 9780309049023
Category : Transportation
Languages : en
Pages : 52
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Book Description
This synthesis will be of interest to traffic engineers, planners, and others interested in making sure that motorists' needs for directional information on freeways are being met. Information is provided on policies and procedures used by states in evaluating freeway guide signs and replacing those that are outdated or deteriorated. Many signs on freeways and other controlled-access highways have exceeded their service life and are no longer serving motorists' needs. This report of the Transportation Research Board describes the policies, proceduress, and criteria used by states for freeway sign evaluation and replacement programs.
Author: Jonathan Upchurch
Publisher:
ISBN:
Category : Photovoltaic power generation
Languages : en
Pages : 84
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Book Description
The principal objective of this study was to demonstrate the technological and economic feasibility (or lack thereof) of photovoltaic powered systems for overhead guide sign lighting, roadway lighting, and traffic signalization. A preliminary technical and economic feasibility study concluded that the first two applications were feasible, but that full-scale traffic signalization was not. In lieu of full-scale traffic signalization, the project developed a system to power flashing warning lights. Photovoltaic systems were designed, constructed, field tested and evaluated for overhead guide sign lighting, roadway lighting, and powering of flashing warning lights. All these systems were found to be dependable and economical for application at remote sites where a conventional power supply is not available. In addition, previous research has shown that roadway lighting can have a safety benefit at remote locations which have a high nighttime accident rate and that flashing warning lights have a safety benefit.
Author:
Publisher:
ISBN:
Category : Air travel
Languages : en
Pages : 752
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Book Description
Author: Purdue University. Department of Engineering Extension
Publisher:
ISBN:
Category : Engineering
Languages : en
Pages : 72
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Book Description
Includes proceedings of various conferences sponsored by the University.
Author: National Research Council (U.S.). Transportation Research Board
Publisher: Transportation Research Board National Research
ISBN:
Category : Transportation
Languages : en
Pages : 162
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Book Description
Author: National Cooperative Highway Research Program
Publisher:
ISBN:
Category : Highway engineering
Languages : en
Pages : 644
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Book Description
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 380
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Book Description
Includes proceedings of various conferences sponsored by the University.
Author: National Research Council (U.S.). Highway Research Board
Publisher:
ISBN:
Category : Highway engineering
Languages : en
Pages : 614
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Book Description
Author: University of Arizona. Civil Engineering Dept
Publisher:
ISBN:
Category : Roads
Languages : en
Pages : 192
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Book Description
