Missouri Trucking Regulations

Missouri follows the federal 80,000 lbs GVW limit on interstate highways. The Missouri Department of Transportation (MoDOT) issues oversize/overweight permits through the Motor Carrier Services Division. Single-trip permits start at $15. Missouri is known for its extensive system of lettered state routes (Route A, B, etc.) which may have lower weight limits than numbered highways. MoDOT operates 7 permanent weigh stations plus mobile enforcement along I-70, I-44, I-55, and I-35. The Missouri State Highway Patrol Motor Carrier Safety Unit conducts approximately 35,000 CMV inspections annually. Overweight fines in Missouri are calculated based on the degree of overweight, starting at $50. Missouri allows 73.5-foot overall vehicle length for standard tractor-trailer combinations.

Missouri's position at the intersection of I-70 (east-west), I-44 (southwest), I-55 (north-south), and I-35 (north-south) makes it one of the nation's key freight hubs. The St. Louis metro area and Kansas City metro area are both top-20 US freight hubs. Missouri follows federal HOS and ELD regulations without state additions. The state has no toll roads on its interstate system (a competitive advantage versus neighboring Kansas and Illinois). The St. Louis Gateway area includes major intermodal facilities, rail terminals, and the Port of St. Louis on the Mississippi River. Kansas City's freight corridor connects to the BNSF and Union Pacific intermodal terminals, handling significant cross-dock and transload operations.

Missouri requires intrastate carriers to register with the Missouri Department of Revenue for motor carrier authority. The state follows federal safety regulations. Missouri does not require periodic safety inspections for commercial vehicles — enforcement relies on roadside inspections. Missouri enforces IFTA and IRP requirements at weigh stations. The state has specific agricultural exemptions for grain, livestock, and hay transport during harvest season. Missouri's extensive cave and karst geology creates bridge and road weight limit considerations in the Ozarks region. The Kansas City and St. Louis areas have specific routing requirements for hazmat loads near population centers and water supply areas.