In Missouri the maximum speed limit on interstate highways and freeways in rural areas is 70 mph (113 km/h). On expressways in rural areas the speed limit is posted at 65 mph (105 km/h) – except the US 54 & US 63 Expressways to the north of Jefferson City with a 70 mph (113 km/h) speed limit. On interstates, freeways, and expressways in urban areas the speed limit is 60 mph (97 km/h), on other numbered state-maintained rural highways is 60 mph (97 km/h) and on state lettered highways the speed limit is 55 mph (89 km/h).
The highways and transportation commission may raise or lower the speed limit on these highways, but no speed limit may be set above 70 mph (113 km/h) on a numbered highway and 60 mph (97 km/h) on a lettered highway.
Interstate highways have minimum speed limits of 40 mph (64 km/h).