Generalized Framework for Developing a Corridor-Level Infrastructure Health Index

Abstract

Current practice in condition rating varies between states. Agencies use methods customized to meet the needs of the individual state. A lack of consistency in the methodology, data collection, and rating calculation techniques makes it difficult to compare assets across state borders and across asset types. To improve the overall condition of National Highway System (NHS) routes, a unified method of condition rating is needed. This paper presents a generalized framework for the rating of infrastructure assets at the corridor level. The paper provides steps that can be used for any asset type to calculate the health rating of the asset and the overall health of a corridor by combining the health ratings of all individual assets and asset types. The paper also presents results of a pilot demonstration of the proposed framework with data for Interstate 81, which were provided by the Virginia Department of Transportation. The health ratings can help engineers, planners, and policy makers to see the current condition of NHS routes and to monitor the results of using different maintenance, repair, and rehabilitation techniques at the state, regional, and national levels. The ratings can help to ensure that the condition of the nation's highway system is consistently at an acceptable level to the governing agency and users alike.