Missouri Speed Limit Increase

What Missouri actually requires

The story above is the enforcement. This is the rule it is enforcing — so you do not have to go looking for it.

Legal without a permit

Legal width (Above this you need a permit)

8'6"

Legal height (Above this you need a permit)

13'6"

Legal gross weight (Above this you need a permit)

80,000 lbs

When escorts kick in

Front escort required over (width)

12'6"

Rear escort required over (width)

12'6"

Escorts both ends over (width)

14'

Height escort / pole car over (height)

15'6"

Escort required over (weight)

220,000 lbs

When you may run — base envelope only, conditions below

Night travel

Allowed

Weekend travel

Allowed

Sunday travel

Allowed

Superload threshold

Superload over (width)

16'

Superload over (height)

16'

Superload over (length)

150'

Superload over (weight)

160,000 lbs

• Width (7 CSR 10-25.020): base overwidth escort threshold is over 12'6" (150 in). Over 12'6"-14': front escort on two-lane, rear on divided/undivided. Over 14'-16': front AND rear on two-lane/undivided, rear on divided. Over 16'-18': front and rear on all highways, plus additional front and a law-enforcement escort on two-lane. Over 18': front, rear and law-enforcement on all highways, plus additional front on two-lane. HEIGHT: over 15'6" (186 in) requires a front height-detection escort on all highways; over 16' adds front on two-lane; over 17' adds law-enforcement on all highways. LENGTH: over 110'-125' = rear on all except divided; over 125'-150' = rear on all; over 150' = rear + law-enforcement, plus additional front on two-lane. WEIGHT: over 220,000-350,000 lb = front escort on two-lane; over 350,000 lb = front and rear on all plus additional front on two-lane. Loads over 160,000 lb require a front and two rear escorts when bridge-crawling in Kansas City and St. Louis. Escort requirements are cumulative; Missouri State Highway Patrol escorts may be added as needed.
• General rule: travel limited to 1/2 hour before sunrise to 1/2 hour after sunset; no movement when roads snow/ice covered, in hazardous cross winds, or visibility under 500'. NIGHT: over-width loads not exceeding 12'6" that are legal height and not over 110' long MAY travel at night. WEEKEND/SUNDAY: allowed generally EXCEPT no Saturday/Sunday movement in the Lake of the Ozarks area (May 25-Labor Day) and the Branson area (May 1-Nov 30) on named routes. METRO CURFEWS (Mon-Fri; NOT overweight-only loads): St. Louis City & County 6:30-9:00 a.m. and 3:30-6:30 p.m.; St. Charles & Jefferson Counties similar; Kansas City area 7:00-9:00 a.m. and 4:00-6:00 p.m.; Springfield 7:00-9:00 a.m. and 4:00-6:00 p.m. Superloads: no movement 6:30-9:00 a.m. and 3:30-6:00 p.m. on non-divided state routes; Sat/Sun only for moves 16' wide or less.
• New Year's Day, Memorial Day, Independence Day, Labor Day, Thanksgiving Day, Christmas Day.

Permit desk: 866-831-6277 · Apply online

Official source · Checked 2026-07-16 · Confidence: high
Only limits we have confirmed are listed. A limit that is not shown is one we have not verified — never read a gap here as "no limit". Always confirm on the permit before you roll.