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TRB Special Report 211: Twin Trailer Trucks examines the potential safety effects of the new federal truck size rules (the Surface Transportation Act of 1982 requires states to permit twin 28-ft trailers on Interstate highways and on principal roads). The study also addressed other effects of the new rules on highway transportation including the trucking industry use of twins, safety consequences of twins, pavement wear and other highway features affected by twins, and safety and pavement wear affected by 48-ft long semitrailers and 102- in. wide trucks. The use of twin trailer trucks will be concentrated in the general freight common carriers sector and will result in a 9% reduction in combination-truck miles in the portion of their hauling that is switched from tractor-semitrailers to twins. It is not expected that either the scope of the current highway network or restrictions on access to that network will have an impact on travel by twins. The increased use of twins will have little overall effect on highway safety. However, twins will accelerate pavement wear and increase rehabilitation costs. The use of 102-in. wide trucks and 48- ft semitrailers (also permitted by the 1982 law) also increases pavement wear. Recommendations are presented that would help coordinate the efforts of various data producers and users of programs that collect nationwide information on truck travel, safety, and highway impact, and thus enhance their ability to provide data addressing policy questions. Recommendations are also made for improving the safety of the vehicles. The various chapters of the book cover the study method and report organization; the historical and regulatory background; use characteristics and cost impacts; safety impacts; highway condition, operation and design impacts; long-term monitoring; and conclusions drawn from the study.
Publisher's Note: Products purchased from Third Party sellers are not guaranteed by the publisher for quality, authenticity, or access to any online entitlements included with the product. The most complete visual guide to servicing medium- and heavy-duty truck systems Written by an expert with decades of experience as an automotive and diesel technician and instructor, Truck and Trailer Systems offers comprehensive information on medium- and heavy-duty truck service. The book begins by discussing the trucking industry, professional certifications, safety, tools, and measuring equipment. Then, each system is thoroughly covered--from electrical and lighting to brakes and transmissions. Factory procedures from the most common manufacturers for diagnosis and repair are presented along with annotated photos and diagrams. This practical, authoritative resource is essential for those starting out in the field as well as experienced professionals in need of a detailed, on-the-job reference. Chapters include: Objectives Notes Cautions Service tips Photos and diagrams Chapter reviews Truck and Trailer Systems covers: Industry safety Basic electrical Magnetism Batteries Starting system Charging system Lighting and wiring Computer systems Mobile heating, ventilation, and air-conditioning systems Tires, wheels, and wheel end systems Frames and suspensions Steering systems Trailers and fifth wheels Hydraulic brake systems Air brake foundation brakes Air brake air systems Antilock brake systems Drive lines Clutches Drive axles Single and twin countershaft manual transmissions Automated manual transmissions Automatic transmissions Allison transmission overhaul PMI Auxiliary power units

Truck Access

United States. Congress. Senate. Committee on Commerce, Science, and Transportation. Subcommittee on Surface Transportation

Published: 1988

Total Pages: 120


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TRB Special Report 227 - New Trucks for Greater Productivity and Less Road Wear: An Evaluation of the Turner Proposal evaluates the approach to regulation of the size and weight of trucks using U.S. roads known as the Turner Proposal. This approach had its origin in a proposal put forth in a 1984 address to AASHTO by former Federal Highway Administrator Francis C. Turner. The approach evaluated by the committee differs in an important respect from Turner's original concept: in the committee's approach, use of the new trucks would be voluntary; that is, truck operators would be offered the choice of continuing with existing equipment and weight rules or adopting the new trucks with the new weight regulations. The committee designed a package of changes in size and weight limits, safety restrictions, and procedures regarding bridge deficiencies, routing, and enforcement that would be a practical regulatory scheme for implementing the Turner concept. The committee recommends that every state, with careful assessment of the risks and uncertainties, consider this proposal as a supplement to current size and weight regulations. If Turner trucks were adopted in all states according to the recommended rules, they would reduce the cost of shipping freight and would not degrade safety. The total cost of maintaining the road system would be reduced, although pavement wear savings would be partially offset by higher bridge costs. The committee that carried out this study identified two truck configurations outside the weight and length limits established by federal law that would offer greater productivity without increasing infrastructure or safety costs. These vehicles formed the basis for the configurations recommended in a later (2002) TRB report, Special Report 267: Regulation of Weights, lengths, and Widths of Commercial Motor Vehicles.
The objective of this report is to identify known relationships between commercial vehicle safety and crash causation factors and to prepare a synthesis of safety implications of oversize/overweight (OS/OW) commercial vehicles. This information can be used to support commercial vehicle enforcement and permitting practices and justify expenditures and investments on size and weight enforcement to enhance safety. In producing this report, insight was gained into the impacts of truck size and weight (TSW) regulations through three case studies. The state of practice in estimating large truck crash rates is complicated because of the many configurations and the wide range of possible weights for any particular configuration. This report highlights four primary findings regarding the contributions of OS/OW to commercial vehicle crashes found by its researchers.