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TRB's National Cooperative Highway Research Program (NCHRP) Synthesis 359: Bridge Rating Practices and Policies for Overweight Vehicles explores overweight vehicle permit processes. The report includes information on state and provincial bridge rating systems, bridge evaluation practices, and permit policies as they relate to overweight and oversize vehicles. The report is designed to help in the understanding of the reasons for nonuniform permitting practices. The report reviews specifications, software types, treatment of nonstandard configurations, and allowance for in-place dead loads; processes of permit review; and personnel assigned to permit review.
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.
This synthesis will be of interest to pavement designers, highway administrators, and others concerned with pavement design, permit issuance and fees for overloaded trucks, and enforcement of truck weight laws. Information is presented on the effects that overloads have on pavements and on the methods of accommodating or controlling overloads. Highway pavements are designed for legal axle loads, and loads above these will significantly shorten pavement life. This report of the Transportation Research Board describes the effects on pavements of loads greater than those used in design, gives information on permit issuance and fees for overloaded vehicles, and describes the difficulties in enforcing truck weight laws.
A sample of permits in the 48 contiguous states for the year 1966 was surveyed to determine the characteristics of oversize-overweight permit operations on state highways in the U.S. Recommendations to change some of the permit practices are presented.
The research described in this report assembles a set of tools based on experiences and best practices in a diverse set of states for linking strategic goals to resource allocation and implementation decisions using aspects of asset management. A survey of practices in each of the state DOT's that explores documents and synthesizes both strategic planning processes and asset management was conducted. With input from an expert advisory panel, five states were for detailed analysis. These are Florida, Maryland, Michigan, Montana and Pennsylvania. The model process that results does not represent any particular state, but incorporates elements from all five states. This model process can provide useful guidance to states interested in augmenting their existing process.