Yellow Transition Lane Control Signal Symbols for Freeway Traffic Management PDF Download
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Author:
Publisher:
ISBN:
Category : Automobile drivers
Languages : en
Pages : 96
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Book Description
This report documents the research performed to assess the effectiveness and applicability of yellow diagonal and downward arrows for freeway traffic management purposes. Researchers examined motorist understanding of and perceived usefulness of the arrows through surveys of San Antonio motorists where these indications are being utilized as part of the TransGuide system. These results were compared to similar data obtained from motorists in Fort Worth where Texas Department of Transportation operates a traffic management system utilizing a yellow X. Researchers also interviewed operators of the TransGuide system to assess their opinions of the yellow arrow indications, and to identify any difficulties they have experienced in utilizing these symbols in their daily traffic management activities. Finally, researchers performed a series of field studies to assess how drivers respond to yellow diagonal arrows and yellow Xs used to transition between a lane open and a lane closed condition. Data collected through this research effort indicates that the use of both the yellow diagonal and downward arrows for freeway traffic management purposes are perceived positively by TransGuide system operators and the motoring public. Furthermore, no evidence of operational problems or difficulties due to the use of either of these non-standard symbols has been collected through field studies in San Antonio. Similar statements can be made concerning the yellow X. Motorists in Fort Worth rate this symbol fairly highly once they see it used in a freeway driving situation. Field studies suggest that the number of drivers exiting a closed lane when first encountering the yellow X symbol equals or exceeds those who would exit for the yellow diagonal arrow.
Author:
Publisher:
ISBN:
Category : Automobile drivers
Languages : en
Pages : 96
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Book Description
This report documents the research performed to assess the effectiveness and applicability of yellow diagonal and downward arrows for freeway traffic management purposes. Researchers examined motorist understanding of and perceived usefulness of the arrows through surveys of San Antonio motorists where these indications are being utilized as part of the TransGuide system. These results were compared to similar data obtained from motorists in Fort Worth where Texas Department of Transportation operates a traffic management system utilizing a yellow X. Researchers also interviewed operators of the TransGuide system to assess their opinions of the yellow arrow indications, and to identify any difficulties they have experienced in utilizing these symbols in their daily traffic management activities. Finally, researchers performed a series of field studies to assess how drivers respond to yellow diagonal arrows and yellow Xs used to transition between a lane open and a lane closed condition. Data collected through this research effort indicates that the use of both the yellow diagonal and downward arrows for freeway traffic management purposes are perceived positively by TransGuide system operators and the motoring public. Furthermore, no evidence of operational problems or difficulties due to the use of either of these non-standard symbols has been collected through field studies in San Antonio. Similar statements can be made concerning the yellow X. Motorists in Fort Worth rate this symbol fairly highly once they see it used in a freeway driving situation. Field studies suggest that the number of drivers exiting a closed lane when first encountering the yellow X symbol equals or exceeds those who would exit for the yellow diagonal arrow.
Author: American Association of State Highway and Transportation Officials. Task Force for Roadside Safety
Publisher:
ISBN:
Category : Roads
Languages : en
Pages : 560
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Author:
Publisher:
ISBN:
Category : Electronic traffic controls
Languages : en
Pages : 64
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Book Description
This report summarizes the research performed and documented in interim project reports to address visibility, spacing, and operational issues pertaining to lane control signals (LCSs) used for freeway traffic management in Texas. Chapters in this final report review the results of legibility studies of new and used LCSs; a TxDOT expert panel meeting to address LCS visibility, spacing, and mounting location issues; and an evaluation of yellow diagonal and downward arrows for freeway traffic management purposes. The final chapter summarizes the findings and recommendations resulting from this research effort.
Author: James D. Carvell
Publisher:
ISBN:
Category : Express highways
Languages : en
Pages : 632
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Book Description
This handbook is an update of the 1983 edition and reflects the tremendous developments in computing and communications technology. It also reflects the importance of "Integrated" Transportation Management Systems and the development of the concept of Intelligent Transportation Systems (ITS). The handbook development began with a survey of current practice, including site visits and interviews, of ten Freeway Management Systems throughout the country. It was developed under the advice of a panel of freeway management practitioners. The 1997 edition is organized in modular fashion with each module addressing a particular aspect or technology of the freeway management task. The modules are stand-alone treatments of particular areas of freeway management but are cross-referenced to reflect their interdependence
Author:
Publisher:
ISBN:
Category : Traffic signs and signals
Languages : en
Pages : 60
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Author:
Publisher:
ISBN:
Category : Electronic traffic controls
Languages : en
Pages : 120
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Book Description
This summary report describes a May 1998 transportation technology scanning tour of four European countries. The tour was co-sponsored by the Federal Highway Administration (FHWA), the American Association of State Highway and Transportation Officials (AASHTO), and the Transportation Research Board (TRB). The tour team consisted of 10 traffic engineers who visited England, France, Germany, and Sweden to observe traffic control devices and methodology and to determine if any European practices should and could be recommended for use in the United States.
Author: Gerald L. Ullman
Publisher:
ISBN:
Category : Electronic traffic controls
Languages : en
Pages : 66
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Book Description
Glance legibility studies conducted at the TTI Proving Grounds examined the legibility of three commercially available lane control signals (LCS) with respect to symbol, signal type, subject gender, and subject age. Also, the effect of ambient light conditions was also explored. Symbols on all three signals resulted in median glance legibility distances of 304.8 meters (1000 feet) or greater, whereas the 85th percentile glance legibility distance was 213.4 meters (700 feet) or greater. Of the various factors examined, only the age of the subject significantly influenced legibility distances. In general, drivers 65 years and older had to be 91.5 to 198.1 meters (300 to 650 feet) closer to the signals to correctly identify the symbols being displayed than drivers aged 16 to 44 years. The report also contains the results of a meeting of TxDOT operations personnel involved in freeway LCS design and operaion. Panel members identified a number of specific problems and concerns regarding LCS design and operation. Panel members identified a number of specific problems and concerns regarding LCS on freeways, and brainstormed about potential solutions and countermeasures to address these concerns.
Author: United States. Department of Transportation
Publisher:
ISBN: 9780935403817
Category : Highway communications
Languages : en
Pages : 780
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Book Description
The Manual of Uniform Traffice Control Devices (MUTCD) is aproved by the Federal Highway Administrator as the National Standard in accordance with Title 23 U.S. Code, Sections 109(d), 114(a), 217, 315, and 402(a), 23 CFR 655, and 49 CFR 1.48(b)(33), and 1.48(c)(2).
Author: Gerald L. Ullman
Publisher:
ISBN:
Category : Automobile drivers
Languages : en
Pages : 102
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Author: Samuel C. Tignor
Publisher:
ISBN:
Category :
Languages : en
Pages : 120
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Book Description
