Hawaii Street Legal Laws

Illinois Street Legal Laws

Idaho Lift Laws and Vehicle Equipment Laws

There are no suspension lift limits or frame height limits in Idaho. Bumper height is limited to 30 inches for 4x4s under 10,000 lbs. GVWR. As long as drivers keep their bumper heights in check, the install of suspension lift kits, aftermarket wheels and tires, performance shocks, aftermarket bumpers, and grille guards is legal.

Update: Effective 6/1/10, Canyon County and the city of Kuna within Ada County require emissions testing.

Governing Laws


Idaho details its street legal laws in the Idaho Statutes (IS).

IS Title 49

Vehicle Dimensions


In Idaho, vehicles must be no larger than 102 inches wide, 14 feet tall, or 45 feet long for a single vehicle.

IS 49-1010

Tire Restrictions


All tires on vehicles driven in Idaho must be safe. There is no listed minimum tire tread depth or restriction on re-grooved tires.

Wheel Restrictions


Wheels are not covered in Idaho's laws.

Braking Requirements


Vehicles driven in Idaho are required to have brakes on all 4 wheels. The brakes must be capable of stopping the vehicle from a speed of 20 mph within 30 feet. A secondary, mechanical, parking brake is also required.

IS 49-933

Steering Laws


Idaho does not have any steering related laws.

Suspension Laws


There are no specific suspension laws in Idaho.

Frame Requirements


To comply with Idaho's street legal laws, a vehicle's frame cannot be lower than the lowest point of the vehicle's wheels.

IS 49-965

Bumper Restrictions


Idaho requires that bumpers be at least 4.5 inches tall. Bumper heights are limited according to the vehicle's GVWR.

Vehicle GVWR

Max. Bumper Height

Under 4,500

Front: 24 inches | Rear: 26 inches

4,501 to 7,500

Front: 27 inches | Rear: 29 inches

7,501 to 10,000

Front: 28 inches | Rear: 30 inches

Over 10,000

Front: 28 inches | Rear: 30 inches

4x4s under 10,000

Front: 30 inches | Rear: 31 inches

( Measured to the bottom of the bumper. )

IS 49-966

Fender Requirements


Fenders and mud flaps are both required in Idaho.

IS 49-949

Lighting Requirements


In addition to headlights and tail lights, vehicles in Idaho 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.

24 inches

54 inches

Tail lights

1 min.

20 inches

72 inches

Spot lights

2 max.



Fog lights

2 max.

12 inches

30 inches

Aux. passing lights

2 max.

24 inches

42 inches

Aux. driving lights

2 max.

16 inches

42 inches

( Measured to the center of the light. )

IS 49-905
IS 49-906
IS 49-918
IS 49-927

Window Laws


It is unclear if windshields are required in Idaho. Vehicles with windshields are required to have windshield wipers.

IS 49-943

Exhaust Requirements


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

IS 49-937

Engine Swap Rules


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

Emissions Testing


Canyon County, Ada County, and the city of Kuna require emissions testing in Idaho.

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