"Lights Out" Overhead Guide Sign Demonstration Project PDF Download
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Author: R. G. McMillan
Publisher:
ISBN:
Category : Reflectors (Safety devices)
Languages : en
Pages : 32
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Author: R. G. McMillan
Publisher:
ISBN:
Category : Reflectors (Safety devices)
Languages : en
Pages : 32
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Author:
Publisher:
ISBN:
Category : Signs and signboards
Languages : en
Pages : 23
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Author:
Publisher:
ISBN:
Category : Roads
Languages : en
Pages : 78
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Book Description
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: Kjetil Emhjellen
Publisher:
ISBN:
Category : Highway communications
Languages : en
Pages : 112
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Book Description
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 : Highway engineering
Languages : en
Pages : 884
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Book Description
Author: California State Library
Publisher:
ISBN:
Category : California
Languages : en
Pages : 516
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Book Description
Author: American Association of State Highway and Transportation Officials
Publisher: AASHTO
ISBN: 156051325X
Category : Technology & Engineering
Languages : en
Pages : 134
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Book Description
This guide replaces the 1984 publication entitled An Informational Guide for Roadway Lighting. It has been revised and brought up to date to reflect current practices in roadway lighting. The guide provides a general overview of lighting systems from the point of view of the transportation departments and recommends minimum levels of quality. The guide incorporates the illuminance and luminance design methods, but does not include the small target visibility (STV) method.
Author: Robert Joseph Dexter
Publisher: Transportation Research Board
ISBN: 0309067243
Category : Lampposts
Languages : en
Pages : 111
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Book Description
