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BackgroundThe Weather Responsive Management Strategies (WRMS) initiative under FHWA’s Every Day Counts – Round5 (EDC-5) program promotes the use of road weather data from mobile and connected vehicle (CV) technologies to support traffic and maintenance management strategies during inclement weather. The goal is to improve safety and reliability, as well as reduce environmental impacts on the transportation system resulting from adverseweather.Across the nation, WRMS can be implemented to mitigate the impacts of various weather conditions. Northern states with hazardous winter weather could deploy WRMS strategies such as enhanced anti-icing and de-icing, plowing, and snow removal. Southern states with tropical weather, such as hurricanes, flooding, or low visibility, could deploy WRMS strategies such as enhanced motorist alerts and advisories or variable speed limits. As part of the WRMS initiative, more than 20 states are leveraging various communications mechanisms, sensor configurations, and software tools to generate and optimize the use of road weather data and information.This case study describes the deployment of WRMS and the benefits achieved by the Minnesota Department of Transportation (MnDOT) using mobile road weather sensor data. MnDOT is one of the first states to implement Integrating Mobile Observations (IMO) technologies, which were deployed under the EDC-4 Weather-Savvy Roadsinitiative.MnDOT’s Integrated Mobile Observations InitiativeMnDOT’s IMO efforts have institutionalized the acquisition, transmission, storage, and use of mobile road weather observations across the state. These sustainable and interoperable processes enhance situational awareness and reduce the costs associated with winter maintenance activities. This is achieved through a hybrid communication method using cellular communications, automated vehicle location, and Dedicated Short Range Communications(DSRC).MnDOT’s fleet of mobile data computer/automated vehicle location (MDC/AVL)-equipped vehicles includes 700 of the agency’s 850 plow trucks, as well as 20 light-duty supervisor vehicles and 32 mower tractors. Mobile data collected by the fleet includes air temperature, relative humidity, surface temperature, wiper status, and brake status. Additionally, about 250 plow trucks capture camera images. Every new plow truck is equipped with AVL andcameras, which is about 57 new plow trucks per year.

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