Impact of HB-1481 on Indiana's highway revenue generation, asset degradation, modal distribution, and economic development and competitiveness.

Everett, Stephanie R.; Athigakunagorn, Nathee; Woldermariam, Wubeshet; Varadarajan, Vinay; Arman, Mohammad; Roshandeh, Arash M.; Gkritza, Konstantina; Labi, Samuel; Sinha, Kumares C. · 2014 · ROSA P / Purdue University. Joint Transportation Research Program

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Summary

This study evaluates the impacts of Indiana House Enrolled Act 1481 (HEA-1481), which established new permitting rules and fee structures for overweight divisible loads on the state’s highway network. Commissioned by the Indiana Department of Transportation (INDOT) and conducted by Purdue University researchers, the analysis was mandated to inform the adoption of final regulatory rules. The research addresses the complex balance between recovering infrastructure costs from heavy trucking operations and maintaining Indiana’s economic competitiveness relative to other Midwestern states. The study compares three distinct fee structures: the pre-HEA-1481 system, an Interim Policy effective from June to December 2013, and the Emergency Rules (ER) that took effect on January 1, 2014. The methodology involved a comprehensive review of existing literature, theoretical modeling, and quantitative impact assessments. Researchers analyzed revenue generation, asset consumption (pavement and bridge degradation), modal distribution, and economic development. For asset consumption, the study utilized Equivalent Single Axle Load (ESAL) metrics to quantify infrastructure damage. To assess modal shifts and economic competitiveness, the team employed the Federal Highway Administration’s Intermodal Transportation and Inventory Cost (ITIC) analysis tool. The analysis specifically focused on the ER fee structure, which introduced commodity-specific permits for agricultural and metal loads, defined standard weight divisors for axle configurations, and implemented a 2.4 ESAL credit to exempt vehicles causing damage equivalent to standard 80,000-lb. trucks from additional permit fees. The findings indicate that HEA-1481 does not dramatically alter the consumption of pavement and bridge assets but leads to a slight increase in revenue per permit and a modest reduction in the gap between infrastructure consumption and collected revenue. Despite this improvement, a significant consumption-revenue gap persists, estimated at approximately $33 million for the pre-HEA-1481 period and $30 million under the Emergency Rules. Regarding operations, the impact on mobility and safety is ambiguous, as traffic impairment from overweight vehicles is offset by a reduction in total trips. The study found little to no shift in modal share between truck and rail; however, it predicted significant changes in specific truck configurations used in operations. Economically, HEA-1481 is expected to enhance Indiana’s competitiveness by lowering permit costs for carriers using vehicles configured to yield less than 2.4 ESALs, particularly for agricultural and metal commodities. The significance of this research lies in its demonstration that HEA-1481 creates a more industry-friendly environment that fosters long-term economic development by reducing transportation costs for major Indiana businesses. The new fee structure incentivizes less-damaging loading behaviors, thereby protecting highway infrastructure while improving the state’s competitive position against neighboring states. The results provide INDOT with the empirical basis required to finalize permitting rules that balance fiscal responsibility with economic growth, ensuring that overweight permitting policies support both infrastructure preservation and the logistical efficiency of the trucking industry.

Key finding

The HEA-1481 permit structure reduced the consumption-revenue gap from $33 million to $30 million while increasing the economic competitiveness of Indiana trucking operations relative to other Midwestern states.

Methodology

modeling

Provenance

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Topics

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• truck driver fatigue