Montana Oversize Load / Pilot Car Requirements (answers from ) 2006 Montana Commercial Vehicle Size and Weight and Safety Trucker's Handbook
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Width: Over 8' 6"
Height: Over 14' 0"
Length: Semi-trailer over 53' 0"
Weight: Over 80,000 lbs. GVW (20,000 lbs. single axle or 34,000 lbs. tandem axle)
Continuous travel allowed for loads not over 10′ wide (9′ 6″ wide for baled hay & hay racks), 14′ 6″ high, 75′ long with overhang, 110′ long with no overhang on non interstate. Non reducible 10′ wide or less may travel on interstate
Daylight travel only, 7 days a week, for loads not exceeding 18′ wide, 18′ high, 120′ long with overhang or 110′ without overhang on non interstate
Daylight travel Monday through Friday only for loads that exceed 18′ wide, 120′ long and 18′ high (exceptions are implements of husbandry)
Travel prohibited on New Years Day, Memorial Day, Independence Day, Labor Day, Thanksgiving Day & Christmas Day (if holiday falls on weekend or Friday, travel prohibited Friday through Sunday. If holiday falls on Monday, travel prohibited Saturday through Monday. If holiday falls on Thursday, travel prohibited for that day only)
Over 10′ wide (not equipped with lights & signs) requires 2 pilot cars
Over 12′ 6″ to 16′ 6″ wide requires 1 pilot car
Over 16′ wide requires 2 pilot cars
Over 110′ long requires 1 pilot car
Over 17′ high with route survey requires 1 pilot car with height pole
Over 16′ 6″ wide requires 1 pilot car
Over 120′ long requires 1 pilot car
No more than 5 OS/OW loads requiring escorts may convoy if width not over 14′ (15′ with projections and not over 120′ long).
No more than 5 OS/OW loads may convoy if length of any unit is greater than 110′ long on interstate highways.
Before crossing any non interstate structure or structures the hauling unit shall come to a complete stop approximately 50 feet from the end of the structure. After flag vehicles or flag persons have stopped all traffic onto the structure, the overweight vehicle shall proceed at a speed not exceeding 5 mph with the center of the unit directly over the center-line of roadway of the structure. There shall be no alteration of speed (changing gears) while on the structure or approaches. Flag vehicles or flag persons shall not allow any other traffic onto the structure until the overloaded vehicle is off the structure. On Interstate Highways: The maximum speed is 55 mph, center-lining of bridges is not required, but must remain in its own traffic lane, and normal traffic will be allowed to pass, and continuous travel is allowed. 18.8.602 ARM
The hauling unit shall come to a complete stop approximately 50 feet from the end of the non-interstate structure. After flag vehicles or flag persons have stopped all traffic from crossing the structure. After flag vehicles or flag persons have stopped all traffic from crossing the structure, the overweight vehicle shall proceed at a speed not to exceed 5 mph with the center of the unit directly over the center line of the roadway on the structure. There shall be no alteration of the speed (changing of gears) while on the structure or approach. Flag vehicles shall not permit any other traffic on the structure until the permitted vehicle is off of the structure.
Phone Numbers, Addresses and Websites:
Montana Road Conditions: (800) 226-7623
Montana State Police: (406) 841-7000
Oversize Permits: (406) 444-6130 Fax: (406) 444-0800
Trip / Fuel Permits: (406) 444-6130
Dept. of Transportation
Motor Carrier Service Division
P.O. Box 4639
Helena, MT 59604
Montana DOT Website - http://www.mdt.mt.gov/
Current Road Conditions - http://www.mdt.mt.gov/travinfo/
Coast 2 Coast Online Permits - http://coast2coasttruckingpermits.com/