Missouri State Highway System

State highways in Missouri were first designated in 1922 and Missouri's system was used (along with Wisconsin's) as a plan for the entire U.S. Highway system which was created in 1926. In Missouri, odd-numbered highways run north-south and even-numbered highways run east-west (with a few exceptions, such as Route 112). Missouri also maintains a secondary set of roads, supplemental routes, which are lettered rather than numbered. In some states (such as Arkansas), highways are allowed to be discontinuous. Missouri overlaps highways in order to maintain continuity.

Missouri State Highway System

State highways in Missouri were first designated in 1922 and Missouri's system was used (along with Wisconsin's) as a plan for the entire U.S. Highway system which was created in 1926. In Missouri, odd-numbered highways run north-south and even-numbered highways run east-west (with a few exceptions, such as Route 112). Missouri also maintains a secondary set of roads, supplemental routes, which are lettered rather than numbered. In some states (such as Arkansas), highways are allowed to be discontinuous. Missouri overlaps highways in order to maintain continuity.