Mississippi Street Legal Laws

Montana Street Legal Laws

Missouri Lift Laws and Vehicle Equipment Laws

Missouri does not have a suspension lift law or a vehicle frame height limit, however, bumper height is restricted depending on the vehicle's GVWR. As long as bumper height is kept legal, residents of Missouri are free to modify their vehicles by installing suspension lift kits, aftermarket wheels and tires, performance shocks, aftermarket bumpers, and grille guards.

Governing Laws


Missouri details its street legal laws in the Missouri Revised Statutes (MRS).

MRS Ch. 307

Vehicle Dimensions


In Missouri, vehicles must be no bigger than 102 inches wide, 14 feet tall, and 45 feet long for a single vehicle.

MRS 304-170

Tire Restrictions


All tires on vehicles driven in Missouri must be safe. There is no listed minimum tire tread depth or mention of tire grooving in the laws.

MRS 307-172

Wheel Restrictions


Wheels are not covered in Missouri's statutes.

Braking Requirements


Vehicles driven in Missouri are required to have functional brakes. A secondary, mechanical, parking brake is required.

MRS 307-170

Steering Laws


Missouri does not have any steering related laws.

Suspension Laws


There are no specific suspension laws in Missouri.

Frame Requirements


The street legal laws in Missouri do not list a maximum frame height.

Bumper Restrictions


Missouri requires that bumpers be at least 4.5 inches tall. Bumper height is limited according to the vehicle's GVWR.

Vehicle GVWR

Max. Bumper Height

Under 4,501

Front: 24 inches | Rear: 26 inches

4,501 to 7,500

Front: 27 inches | Rear: 29 inches

7,501 to 9,000

Front: 28 inches | Rear: 30 inches

9,001 to 11,500

Front: 29 inches | Rear: 31 inches

( Measured to the bottom of the bumper. )

MRS 307-172

Fender Requirements


Fenders and mud flaps are only required on commercial vehicles in Missouri.

MRS 307-015

Lighting Requirements


In addition to headlights and tail lights, vehicles in Missouri are allowed to have additional lights installed. When a vehicle is equipped with extra lighting, no more than 4 front lights can be on at one time while driving.



Min. Height

Max. Height


2 min.



Tail lights

2 min.

15 inches

72 inches

Spot lights

1 max.



Aux. driving lights

3 max.

12 inches

42 inches

( Measured to the center of the light. )

MRS 307-045
MRS 307-075
MRS 307-090
MRS 307-080
MRS 307-105
MVI Manual

Window Laws


It is unclear if windshields are required in Missouri, however, vehicles with windshields must have windshield wipers.

MVI Manual

Exhaust Requirements


In Missouri, vehicles are required to be equipped with mufflers. Exhaust cutouts and bypasses are not allowed to be installed.

MRS 307-170

Engine Swap Rules


Engine modifications and engine swaps are not covered in Missouri's laws.

Emissions Testing


5 counties in Missouri currently require emissions testing.

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