Development of Technical Guidance for the Assessment of Oversize and Overweight Vehicle Permit Fees in New Mexico (Phase II)
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2022-03-01
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Edition:Final Report
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Abstract:The adverse impact of oversize/overweight (OS/OW) vehicles on pavements and bridges is a concern in New Mexico and other states due to the infrastructure damage caused by the large loads that are transported on the highway system. Moneys generated from permit fees should cover administrative and technical costs associated with the permitting process. In addition, the generated funds should cover a justifiable portion of the costs associated with maintenance, repair, and reconstruction of pavements and bridges impacted by OS/OW vehicles. In general, for single-trip permits, the fees are charged based primarily on how much the gross vehicle weight (GVW) of the permit load exceeds the legal load limits. This project was conducted for the New Mexico Department of Transportation (NMDOT) to evaluate the current OS/OW single-trip permit fees charged in New Mexico and provide options for adjusting the fees to correlate with the (1) fees charged in neighboring states and (2) projected damage imposed to pavements and bridges. The project was conducted by way of three tasks. In Task 1, the most common OS/OW load configurations in the state of New Mexico (based on GVW, size, distance traveled, and axle configurations) and most common OS/OW travel routes are determined. The primary deliverable from this task is the selection of ten OS/OW vehicle configurations (including two fracking coil vehicles). In Task 2, the costs of mobilizing the vehicles identified in Task 1 (based on similar route types and travel distances in Arizona, Colorado, Oklahoma and Texas) are evaluated in comparison to New Mexico. A simple revenue assessment is also provided based on various adjustments to the current permit fees that would bring New Mexico on par with neighboring states. In Task 3, literature reviews of current and developing methods used by state Departments of Transportation (DOTs) to quantify damage caused by OS/OW vehicle traffic to pavements and bridges are conducted. Attention is given to collecting the information necessary to conduct technical analyses of damage, identifying information gaps that could limit the analyses, and developing a multi-stage framework for quantifying the effects of damage and associated costs. The basic framework is based primarily on pavement damage as characterized by equivalent single axle loads (ESALs) and secondarily on bridge damage as defined by changes in the condition ratings in OS/OW traffic corridors.
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