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Author : Transportation Research Board
Publisher : Unknown
Page : 128 pages
File Size : 55,6 Mb
Release : 2011
Category : Electronic book
ISBN : OCLC:1065907185
Author : Anonim
Publisher : Unknown
Page : 544 pages
File Size : 55,8 Mb
Release : 2011
Category : Highway research
ISBN : MINN:31951P011774883
Author : Transportation Research Board
Publisher : National Academies Press
Page : 283 pages
File Size : 47,8 Mb
Release : 2005-07-14
Category : Transportation
ISBN : 9780309077019
TRB Special Report 267 - Regulation of Weights, Lengths, and Widths of Commercial Motor Vehicles recommends the creation of an independent public organization to evaluate the effects of truck traffic, pilot studies of new truck designs, and a change in federal law authorizing states to issue permits for operation of larger trucks on the Interstates. In 1991, Congress placed a freeze on maximum truck weights and dimensions. Some safety groups were protesting against the safety implications of increased truck size and weight, and the railroads were objecting to the introduction of vehicles they deemed to have an unfair advantage. Railroads, unlike trucking firms, must pay for the capital costs of their infrastructure. The railroads contend that large trucks do not pay sufficient taxes to compensate for the highway damage they cause and the environmental costs they generate. Although Congress apparently hoped it had placed a cap on maximum truck dimensions in 1991, such has not proven to be the case. Carriers operating under specific conditions have been able to seek and obtain special exceptions from the federal freeze by appealing directly to Congress (without any formal review of the possible consequences), thereby encouraging additional firms to seek similar exceptions. In the Transportation Equity Act for the 21st Century, Congress requested a TRB study to review federal policies on commercial vehicle dimensions. The committee that undertook the study that resulted in Special Report 267 found that regulatory analyses of the benefits and costs of changes in truck dimensions are hampered by a lack of information. Regulatory decisions on such matters will always entail a degree of risk and uncertainty, but the degree of uncertainty surrounding truck issues is uunusually high and unnecessary. The committee concluded that the uncertainty could be alleviated if procedures were established for carrying out a program oof basic and applied research, and if evaluation and monitoring were permanent components of the administration of trucking regulations. The committee recommended immediate changes in federal regulations that would allow for a federally supervised permit program. The program would permit the operation of vehicles heavier than would normally be allowed, provided that the changes applied only to vehicles with a maximum weight of 90,000 pounds, double trailer configurations with each trailer up to 33 feet, and an overall weight limit governed by the federal bridge formula. Moreover, enforcement of trucks operating under such a program should be strengthened, and the permits should require that users pay the costs they occasion. States should be free to choose whether to participate in the permit program. Those that elected to do so would be required to have in place a program of bridge management, safety monitoring, enforcement, and cost recovery, overseen by the federal government. The fundamental problem involved in evaluating proposals for changes in truck dimensions is that their effects can often only be estimated or modeled. The data available for estimating safety consequences in particular are inadequate and probably always will be. Thus, the committee that conducted this study concluded that the resulting analyses usually involve a high degree of uncertainty. What is needed is some way to evaluate potential changes through limited and carefully controlled trials, much as proposed new drugs are tested before being allowed in widespread use. The committee recommended that a new independent entity be created to work with private industry in evaluating new concepts and recommending changes to regulatory agencies. Limited pilot tests would be required, which would need to be carefully designed to avoid undue risks and ensure proper evaluation. Special vehicles could be allowed to operate under carefully controlled circumstances, just as oversize and overweight vehicles are allowed to operate under special permits in many states. Changes in federal laws and regulations would be required to allow states to issue such permits on an expanded network of highways, under the condition that a rigorous program of monitoring and evaluation be instituted.Special Report 269 Summary
Author : Anonim
Publisher : ASTM International
Page : 875 pages
File Size : 43,9 Mb
Release : 1978
Category : Electronic
ISBN : 8210379456XXX
Author : National Cooperative Highway Research Program
Publisher : Unknown
Page : 156 pages
File Size : 53,5 Mb
Release : 2009
Category : Highway research
ISBN : CORNELL:31924071691822
Author : Anonim
Publisher : Unknown
Page : 120 pages
File Size : 54,6 Mb
Release : 2011
Category : Local transit
ISBN : UCBK:C104582405
This digest presents the results of NCHRP Project 20-65 (Task 23) ... The project was conducted by AECOM of Arlington, VA, with Principal Investigator Ashok Sundararajan, Vi Truong, and Laura Reigel.
Author : Peter Frederick Lagasse,National Cooperative Highway Research Program
Publisher : Transportation Research Board
Page : 284 pages
File Size : 55,8 Mb
Release : 2007
Category : Scour at bridges
ISBN : 9780309099097
Explores practical selection criteria for bridge-pier scour countermeasures; guidelines and specifications for the design and construction of those countermeasures; and guidelines for their inspection, maintenance, and performance evaluation. Produced along with the report is an interactive version of the countermeasure selection methodology, which defines the proper conditions for the use of each specific countermeasure, and a reference document that contains detailed laboratory testing results and translations of three German "Code of Practice" documents.
Author : National Cooperative Highway Research Program
Publisher : Unknown
Page : 240 pages
File Size : 42,9 Mb
Release : 2002
Category : Highway engineering
ISBN : NWU:35556034593665
Author : National Research Council (U.S.). Transportation Research Board
Publisher : Unknown
Page : 52 pages
File Size : 54,6 Mb
Release : 2005
Category : Highway research
ISBN : CORNELL:31924101890717
Author : Transit Cooperative Research Program
Publisher : Transportation Research Board
Page : 209 pages
File Size : 54,9 Mb
Release : 2010
Category : Bus lines
ISBN : 9780309154918
TRB's Transit Cooperative Research Program (TCRP) Report 139: Guidebook for Recruiting, Developing, and Retaining Transit Managers for Fixed-Route Bus and Paratransit Systems explores resources for fixed-route bus, general public demand response, and Americans with Disabilities Act (ADA) paratransit systems resources to assist in the recruitment, development, and retention of managers. The Guidebook is accompanied by CRP-CD-77, which provides Model Job Descriptions for 32 broad job titles that indicate the structure and content for job descriptions for manager jobs. The CD-ROM is also available for download from TRB's website as an ISO image. A separate report presenting the research methodology, the results of a literature review, and the results from focus groups held with 15 other non-transit public and private sector organizations used in production of TRCP Report 139 is available online.
Author : American Society for Testing and Materials. Committee C-9 on Concrete and Concrete Aggregates
Publisher : Unknown
Page : 888 pages
File Size : 53,5 Mb
Release : 1978
Category : Béton
ISBN : UCAL:B4144313
Author : Joseph Paul Leidy,Clyde E. Lee,Robert Harrison
Publisher : Unknown
Page : 112 pages
File Size : 48,6 Mb
Release : 1995
Category : Traffic flow
ISBN : NWU:35556025717547
Axle load and gross-vehicle weight characteristics of Mexican-origin commercial trucks processed through the U.S. Customs yard in the city of Laredo, Texas, are described in this report. Investigation of these characteristics particular to Mexican-origin trucks is directed by a Texas Department of Transportation (TxDOT)-sponsored study entitled "Multi-Modal Planning and the U.S.-Mexico Free Trade Agreement" as a prerequisite to evaluating the potential damage to Texas highways posed by international trade traffic. Justifiable concern exists not just with the increasing volume of trade-related truck traffic, but also with the loads carried by Mexican-origin trucks. This study is facilitated by the installation of a weigh-in-motion (WIM) system at the preeminent Southwestern commercial truck port-of-entry (Laredo). Load summaries are presented on five basic truck classes (by axle count) and are based on the original Association of American State Highway and Transportation Officials (AASHTO) pavement damage relationships.
Author : Anonim
Publisher : Unknown
Page : 724 pages
File Size : 50,5 Mb
Release : 1974
Category : Air travel
ISBN : UOM:39015047965903
Author : Anonim
Publisher : Transportation Research Board National Research
Page : 128 pages
File Size : 54,9 Mb
Release : 2009
Category : Transportation
ISBN : NWU:35556039609953
Examines five broad areas of performance including transportation, environment, economics, community, and cost.
Author : Songrit Chayanan
Publisher : Unknown
Page : 70 pages
File Size : 55,8 Mb
Release : 2003
Category : Regression analysis
ISBN : UCBK:C100944902