Evaluation of LADOTD traffic load data for determination of traffic load equivalency factors.

Evaluation of LADOTD traffic load data for determination of traffic load equivalency factors.

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    This study updates Louisiana's Load Equivalency Factor (LEF) tables, which are used as an integral part of the State's highway design and rehabilitation effort. This study was required because the tables have not been updated in over 15 years and are, as such, overdue for revision. Attempts were also made to quantify Louisiana's traffic growth trends for similar reasons. The trend analysis ultimately proved to have inherent problems associated with the statistical significance of the representative data and, thus, had to be abandoned. In conjunction with this, a full statistical analysis of all representative LEF data was also carried out to quantify the significance of the derived LEF table figures. Methods used to update the tables found in this report made use of the techniques and resources prescribed by the Highway Performance Monitoring System (HPMS), as developed by the Federal Highway Administration (FHWA), along with procedures developed by the American Association of State Highway and Transportation Officials (AASHTO). Sources of raw data needed to carry out investigations are drawn from the Louisiana Department of Transportation and Development's (LADOTD's) Weigh-In-Motion (WIM) program and Louisiana's Traffic Volume Monitoring (TVM) program. Computer data processing is used to expedite the investigative process as much as possible. This effort uses the FHWA's Vehicle Travel Information System (VTRIS) software for primary calculations. Results of this study include revised LEF tables and associated significance figures. Findings indicated that the 15-year-old tables do require revision, because the figures were, in some cases, significantly lower than the revision figures. Trend figures could not be accurately calculated due to a shortfall in relevant data.
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