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Assessing the Effectiveness of Friction as a Performance Management Tool in Colorado
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2022-09-01
[PDF-17.69 MB]
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Abstract:The objective of this project was to evaluate the feasibility of using roadway friction data as a key component of a winter maintenance performance management tool by the Colorado Department of Transportation (CDOT). Work accomplished to support these findings identified states and countries that are using roadway friction data in performance management tools to support WMO. Based on a review of the literature, sufficient work has been done on the use of roadway friction data in performance management tools by other agencies to ensure the feasibility of CDOT using roadway friction data in this capacity. RWIS based and mobile roadway friction data sources in Colorado were assessed to determine if friction data of sufficient resolution and quality was available to support a performance management tool. Test sections along I-25 and I-70 were identified for further analysis. Sufficient RWIS based roadway friction data is present in the Greater Denver Area, Upper Front Range, and Intermountain Regions of Colorado to allow for analysis of use in the performance management tool. In the locations where mobile roadway friction data is collected, additional and more consistent data collection is recommended, and a mobile friction sensor data collection protocol guide is suggested to be developed to support this. The application of available roadway friction data in existing performance management tools was assessed. Based on topographical, weather, and climatic differences across the US, it is recommended that CDOT modify an existing performance management tool (Idaho Method) for application in Colorado. The following recommendations for implementation of friction data in a performance management tool were made - use a data driven step down approach to a less conservative roadway friction threshold value (starting at µ=0.6) in the application of ITD PI, CDOT should be careful to ensure the correct roadway friction data that meets the friction threshold is used. Training materials were developed to support the use of roadway friction data in CDOTs winter maintenance operations and in a performance management tool. Recommendations were made to support to use of friction data by CDOT.
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