I-70 is the spine that runs the county's towns and traffic

Interstate 70 crosses Montgomery County from east to west and is the main route tying the county to Warrenton and St. Louis to the east and Columbia to the west. Several of the county’s towns and service clusters, including New Florence, Jonesburg, and the Danville and Montgomery City interchanges, sit on or near the highway, so the interstate shapes where gas, food, and lodging gather. For drivers the practical points are seasonal: I-70 carries heavy through traffic and is a corridor for winter-weather advisories and work zones, and a single closure can push traffic onto county and outer roads not built for it. The MoDOT Traveler Information Map is the official place to check current closures, work zones, and winter road reports before a trip, especially in storm season.