Winter Weather Dynamic Advisory Messaging Logic

Variable Speed Limit (VSL) systems aim to provide realistic, reliable, and real-time speed limit information to roadway users. The Iowa DOT has deployed four VSL systems that are currently running in ghost mode; the goal of this research was to develop new advisory speed limit logic for winter weather operations and to advise drivers of safe speeds based on road conditions ahead. 

Learning Objectives: 

– Advise motorists of preferred speed based on the impacts of winter weather 

– Describe the use of machine learning for Dynamic Message Sign control logic 

– Deploy message signs to avoid the first winter weather accident