There are over 130 miles of active railroad tracks, one major airport, and one seaport in Miami-Dade County. These represent the infrastructure used to move the highest flow of commodities anywhere in Florida, at more than 120 million tons annually.  This infrastructure is critical to the While freight movements represent a small portion of the traffic on Miami-Dade County highways, for some of the key freight routes, up to 20% of the traffic is made up of freight truck vehicles.