OVERVIEW
PERMITS: Missouri oversize permits are valid for seven days. Must have permit prior to entering the state.
OPERATING TIME: One-half hour before sunrise to one-half hour after sunset, including Saturday and Sunday, except that loads over 14′ wide will not be allowed weekend travel. Travel times are more limited in metropolitan and tourist areas (see Restricted Travel section below). Overweight only up to 112,000 pounds gross with legal size may travel 24 hours except metro and tourist areas.
RESTRICTED TRAVEL: No travel on major Holidays, and from noon the day before these holidays or holiday weekends. No travel weekdays from 6:30 am to 9:00 am and 3:30 pm to 6:30 pm, in St. Louis city and county (except for route 370), St. Charles County on I-70, route 94 and route 40/61 and , and Jefferson County on I-55 and on routes 21, 30, 141 and 61/67. No travel from 7:00 am to 9:00 am and 4:00 pm – 6:00 pm in the Kansas City area on routes 150, 291, I-470, 291, 152 west to I-435 and inside the area bounded these routes, and inside the city limits of Springfield except on I-44 and Route 65. These metro area curfews do not apply to loads that are overweight only. No permit movement is allowed on Mississippi River bridges in St. Louis on I-70, I-55, I-64 and on route 60/62 to Cairo, IL. During the tourist season, Saturday and Sunday travel are not allowed on routes in Lake of the Ozarks and Branson (within 10 miles of Branson), with the exception of route 65 in Branson area. Tourist season means June 1 through Labor Day at Lake of the Ozarks and through October 31st in Branson area. These curfews are listed in more detail in part 9 of the MO Permit Regulations Booklet, which is available to drivers and should be carried if you do O/D loads in Missouri.
LEGAL DIMENSIONS
Length:
- 53′ semi-trailer and load (including rear overhang) on Interstate and designated highways
- 60′ when more than 10 air miles from designated system
Width:
- 8′-6″ on Interstate, designated highways
- 8′ on other roads
Height:
- 14′ on designated highways
- 13′-6″ on other roads
Note: Over height must be on drop-deck trailer to be permitted.
Weight: 80,000 Gross
- Single – 20,000 (22,000 on secondary)
- Tandem – 34,000 (36,000 on secondary)
- Tridem – 34,000 (8′ of spacing); 42,500 (9′ of spacings)
Note: Missouri will not give a permit for legal gross weight, but overweight on an axle group.
ROUTINE PERMIT LIMITS
Length: 150′
Width: 16′
Height: 16′ (15′-7″ maximum on some routes)
Weight:
- 5 axles – 104,000
- 6 axles – 120,000
- 7 axles (1-3-3) – 130,000
- Single – 20,000
- Tandem – 46,000 (40,000 on a 10′ spread)
- Tridem – 60,000
- Quad – 72,000
Note: A 1-2-2-1 (tandem drive tractor, tandem trailer and booster) combination is not permitted in Missouri. You must have a Tridem drive tractor to use a tandem trailer and a booster.
Loads exceeding these dimensions or gross weight over 160,000 pounds are considered as Super Loads.
ESCORTS
Length: Over 90′ – one escort on all highways except divided highways
Width:
- Over 12′-4″ – one escort (two escorts off designated highway system)
- Over 14′ – one escort on Interstate and divided highways
- two escorts required on two-lane and undivided highways
Height:
- Over 15′-6″ on two-lane & undivided
- Over 15-6″ divided highways – route survey and one escort with high pole. Utility bucket truck may be required to lift wires.
Signs, Flags, and Lights: “Oversize Load” signs are required on front and rear of the load vehicle when width exceeds 10′-6″, and on the rear of the load when overall length exceeds 90′. Flags are required at the extreme ends or projections of all overwidth and overlength loads.