Case Study: Tennessee Department of Transportation

Semi truck driving in the rain

Tennessee DoT pushes fog to the edge with IoT

With Cisco Connected Roadways, the Tennessee Department of Transportation uses a real-time sensor network that reads weather conditions and density to power instant fog alerts. These alerts can be policy-automated to reduce congestion, accidents, and deaths along main roads.


Cars on a divided highway with surrounding grass and trees


  • Ongoing safety issues exacerbated by thick fog
  • Outdated technology with limited reliability and requiring costly maintenance
  • High failure rate of existing terminal servers
  • Lack of automation and integration within existing networks, delaying emergency and signage updates
  • Lack of real-time data and capabilities to update drivers of perilous conditions
Bird’s eye view of a highway interchange and surrounding trees


Looking down on busy city street with traffic at intersection


  • Enhanced management services via single pane of glass
  • Foundation for secure and agile deployment of roadside services, including first responders
  • Automation of formerly manual operations, including digital signage and emergency updates
  • Reduced road accidents by improving traffic management in adverse conditions
  • Future expandability to improve data collection and road safety

What they’re saying

Tunnel under bridge with traffic in city

"Cars don’t have to be smart to benefit from the increased safety in this vision – every car on that roadway will see that the signs are changing, and know to slow down."

Mark Knellinger, Systems Engineer, Cisco

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Looking down on several intersections in a city

Who is the Tennessee Department of Transportation?

Industry: Government/Transportation
Location: Nashville, Tennessee
Agency size: 3,900 employees