Winter Maintenance Multispectral Performance Evaluation: Salt Brine versus Solid Salt Applications
Publication: Journal of Cold Regions Engineering
Volume 38, Issue 4
Abstract
Performance measures that are commonly used in winter maintenance provide valuable information. However, some metrics are subjective (i.e., visual inspection), rely on historical records, depend on agencies’ practices, or only capture specific information. Winter maintenance performance measures are evaluated independently, and relationships among variables are not assessed. Therefore, the metric travel disruption (TD) is proposed in this study to perform a multispectral evaluation with input, output, and outcome-based performance measures to compare salt brine with solid salt applications. The metric TD integrates different sources of information to estimate a continuous performance measure that accounts for storm, vehicle operations, and roadway conditions over time instead of intermittent measurements or one-time observations, such as roadway friction or time to bare/wet. The input performance measures included storm conditions, type of chemical material, frequency of application, and application rate. The output performance measures were the amount of material used and the lane kilometer (miles) covered. The outcome performance measures consisted of time to bare/wet, speed reduction period, speed recovery period, storm impact period, maximum speed reduction, and TD. For salt brine, previous research has shown reduced salt usage, shorter times to bare/wet, and higher friction. However, there are some concerns regarding the operational and safety performance of roadways that are treated with salt brine. Winter treatment field data and vehicle probe data from the National Performance Management Research Data Set (NPMRDS) were collected from the study (salt brine) and control (solid salt) routes in Wisconsin. For the amount of salt used, the study routes used 32.6% less overall salt than the control routes per storm. The TD indicated that, on average, there was no statistically significant difference between the study and control routes. Despite the lower amount of salt that was used, roadways that were treated with salt brine had a similar operational performance as roadways that were conventionally treated with solid salt, which made salt brine application a cost-effective strategy. This evaluation demonstrated a multispectral performance evaluation of winter maintenance to appropriately quantify the effectiveness of treatments.
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Data Availability Statement
Some or all data, models, or codes that support the findings of this study are available from the corresponding author upon reasonable request. Data upon request include weather data during storms, material and amount used per storm, application rate of deicing by storm, times to bare/wet by storm, and speed data for selected winter storms.
Acknowledgments
The authors are thankful for the assistance that was provided by James Hughes, Emil Juni, Cody Churchill, and Michael Adams from the Wisconsin Department of Transportation. The authors also want to strongly acknowledge the data collection efforts carried out by staff and representatives from Dane, Jefferson, and Marquette counties, Wisconsin.
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© 2024 American Society of Civil Engineers.
History
Received: Dec 21, 2023
Accepted: May 21, 2024
Published online: Sep 16, 2024
Published in print: Dec 1, 2024
Discussion open until: Feb 16, 2025
ASCE Technical Topics:
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