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Bridge Formula Weights

Explaining the maximum weight any combined set of axles on a truck and trailer can carry to cross a bridge on the Interstate highway system.  The following formula is used for calculating acceptable weights:

W=500 [ LN/N-1 + 12N + 36]

W= the overall gross weight on any group of two or more consecutive axles the the nearest 500 pounds.

L= the distance in feet between the outer axles of any group of two or more consecutive axles.

N= the number of axles in the group that are under consideration.

Axle spacing is another consideration that must be taken into account when looking at the Federal weight compliance laws.  In order to properly protect our bridges the number and the spacing of truck and trailer axles carrying the shipment must be calculated.  So a bridge weight formula applies when the gross weight on 2 or more consecutive axles exceeds the limitations on the formula, except that the 2 consecutive sets of tandem axles may carry a gross weight load of 34,000 pounds each if the overall distance between the 1st and last axle is  over a 36′ minimum.

There are exceptions.  Federal law does include an exception to the Federal Bridge Formula and the bridge table. 2 consecutive sets of tandem axles may carry 34,000 pounds each IF the overall distance between the first axle and last axles of these tandems is 36′ or greater.  For example:  a 5 axle tractor semi trailer combination may carry 34,000 pounds of weight both on the tractor tandem (axles 2 and 3) and the trailer tandem (axles 4 and 5), provided the axles 2 and 5 are spaced at least 36′ from each other.  Without this exception the bridge formula would allow for actual weight of only 66,000 pounds to 67,000 pounds on tandems spaced 36′ to 38′ apart. (References: U. S. Department of TransportationFederal Highway AdministrationBridge Formula Weights“)

Note:  In addition to the above formula weights Federal law says that a single axle is limited to a maximum of no greater than 20,000 pounds and that axles that are closer than 96″ from each other are limited to a maximum weight of 34,000 pounds.  Also that gross vehicle weight be less than 80,000 pounds

New York State Shipping Regulations

These are the New York state shipping regulations, limitations, rules and laws for the trucking of oversize and over weight loads over the roads and highways in the state of New York.

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New York State Trucking information website:  https://www.nysdot.gov/portal/page/portal/index

Legal Loads.
Length:  65’
Weight:  GVW 80,000 lbs.
Width:  8’ or 8’ 6” on Interstate and other designated highways.
Height:  13’ 6”

New York State

Routine oversize shipping, trucking and transport permits.
Length:  100’
Weight:  5 axles 110,000 lbs. or 6 axles 132,000 lbs.
Width:  14’ and if over 16’ a bond must be posted.
Height: 13’ 11” and if over 14”, you will need a route/height survey.

How to apply for trucking permits.
Department of Transportation Trucking Permit Unit
518-457-1155 Phone
518-457-0367 Fax
Permit costs $40.00 and is valid for 8 days

Pilot – Escort Car Requirements.
NOTE: Police escorts are required for trucks pulling loads that exceed the following:
Width: On 2 Lanes:  Over 16’
Multi-Lanes: Over 18’
Length: On 2 Lanes:
Multi-Lanes: Height: 16’ or more
Weight: 200,000 lbs.

Travel Restrictions.
Travel is permitted from ½ hour before sunrise to ½ hour after sunset Monday thru Friday and Saturday until noon.
NOTE: This State does have something called a “thruway permit” which can provide continuous travel. Inquire with the Department of Transportation and Trucking Permit Unit listed above.

 

 

 

New York superload information.

The information contained in these pages is research information primarily for use by oversize and overweight trucking company drivers, dispatchers and pilot car companies. While every effort is put into maintaining the accuracy of this information you must absolutely verify this information with the New York State DOT Permits office before commencing movement.

 

 

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Michigan State Shipping Regulations

Michigan State Shipping Regulations

These are the Michigan state DOT shipping regulations, limitations, rules and laws for the trucking of oversize and over weight loads over the roads and highways.

Michigan

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Trucking company & pilot car directory.

Locate trucking companies and pilot cars in Michigan state:

Michigan trucking company directory.
Michigan pilot car company directory.
Michigan easy do it yourself trucking permits.

Legal load limits.

Michigan legal load limits:

Length: Overall no longer than 75’ on designated highways.  Trailer length maximum is 50’.
Width:  96″ on non designated highways and 102″ (8’ 6”.) on designated.
Height: 13’ 6”
Weight: 80,000 lbs. GVW, 20,000 single, 34,000 tandem.
Overhang: 3’ in the front and anything over 4’ in the rear must be red flagged in the day and red light at night.

NOTE: You can check out the maximums on the Michigan state website as well. State maximums Michigan DOT website.

Routine trucking permits.

Routine overweight, oversize trucking and transport permits:

Length: Under 150’ long is routine.  Anything over is superload (105’ for mobile homes).
Width: Figure up to 16’ as a routine permit.  Anything over is going to looked at seriously and they may even classify you as superload (confirming 16’ as no typo).
Height: Up to 15’ is routine.  If you are over 15’ high count on needing a route survey.
Weight:  They will not confirm anything. Anything over 80,000 lbs is looked at on a case by case basis. Anything over 150,000 lbs is subject to a bridge weight study.
Overhang: Check with the Michigan DOT office for clarification.

Superload information.

Information about shipping superloads in the state of Michigan.

If your shipment is in excess of any of the following then you will be classified as a superload:

Length: Anything over 150′
Width: 16′
Height: 15′ – yes this is correct.
Notes: We have no weight max. Height may be on a case by case basis. Permit and info from Michigan DOT.

Legal travel times.

Travel times and restrictions:

Travel time is sunrise to sunset daylight only with the half hour after sunrise and a half hour after sunset leniency rule.  No weekend travel.  No holiday travel or the day after Christmas or Thanksgiving. They have rush hours rules from 7:00 AM to 9:00 AM and 3:00 PM to 6:00 PM in a whole list of counties (look on permit). Wind restrictions if over 24 MPH you can’t run. Frost and thaw laws in effect from Feb. until April on weight. You can view the original publish here and there is more information on Michigan thaw laws here as well.

When pilot cars are required.

When a pilot car or escort vehicle is needed:

Length: 90’ to 100’ one on the rear. Over 100’ needs a rear and a chase pilot car.
Width: Loads over 12 wide on 4 lane is required one rear. Front is required for loads on 2 lane highway over 12’ wide.  Front and rear is required for loads over 14’ wide. Front escort with height pole is required for 14’ 6” and over.
Height: Over 14’ 5” needs high pole. Over 15’ needs one front and one rear.
Overhang: If over 15’ one rear escort is needed.
Weight: If truck can maintain minimum speeds no pilot cars required unless excessive or superload.
Note: Allow 1 to 10 days for permits to be approved. Distance for pilot car to lead/chase load 500′ unless otherwise stated on permit. This is the distance between lead/chase and the truck/trailer. Maximum speeds of 45 MPH if 4 or more lanes, 35 MPH is under 4 lanes. Also read travel restrictions below.

Michigan DOT & misc. information.

Michigan DOT contact & misc. information:

Mailing address:
Michigan Department of Transportation – DOT
PO Box 30050
Lansing, MI  48909

Physical address:
Michigan Department of Transportation – DOT
7050 West Saginaw, Suite 43
Lansing, MI  48917

Farmers in Michigan read the laws.
Mobile homes and modular home shipments.
Email: click here for e-mail contact form on state website.
Help line: 517-241-8999 or main: 517-373-1837 Fax: 517-373-4340
Hours: Monday – Friday 7:30 AM – 4:30 PM

Eastern Standard Time

The information contained in these pages is research information primarily for use by oversize and overweight trucking company drivers, dispatchers and pilot car companies. While every effort is put into maintaining the accuracy of this information you must absolutely verify this information with the Michigan State DOT Permits office before commencing movement.
Michigan state DOT regulations for heavy haul and oversize loads.

Michigan state flag.

Alaska Shipping Regulations

Alaska Shipping Regulations

Alaska shipping regulations, DOT limitations, rules and laws for the trucking of oversize and over weight loads over the roads and highways for pilot cars and trucking companies.

Alaska shipping regulations for oversize and overweight trucking and DOT permit information.

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Heavy haul trucking, pilot cars and permits.

Locate heavy haul, oversize equipment shipping companies, pilot cars and ordering trucking permits in Alaska:

Legal load limits.

Legal load limits:

Length:  53’ Trailer Length
Width:  8’6”
Height: 14’
Weight: Depending on route 80,000 lbs GVW.
Overhang: 3’ in the front, 4’ in the rear.

Routine trucking permits.

Trucking oversize and overweight permit limits:

Length: Shipping varies due to routing and season.
Width: Shipping rules vary depending on route and seaason.
Height: Over 14′ and once again everything varies depending on routing and season.
Weight: Single; 30,000 lbs, tandem; 56,000 lbs, tridem; 70,000 lbs, quadem 80,000 lbs, gross weight; 150,000 lbs. Depends on the route you wish to travel, distance and the bridges you intend on crossing.
Overhang:  20′ is a safe number but once again everything up here is seasonal as roads are closed or combined with weight frost laws may be in effect and limit you.  For the most part there is no such thing as a “routing” shipment in Alaska.

Notes:  When between the months of October 1 and March 31 for 1, 2 & 3 drive axle groups on truck tractors intending to travel the Dalton, Elliott or Steese highways between Fairbanks and Prudhoe Bay you can shift your legal axle weights to make them legal. The following weights on these routes apply: single; 22,000 lbs with 8′ 1″ minimum spacing between axles, tandem; 42,000 lbs, tridem; 48,000 lbs maximum.

When pilot car is required.

Pilot car (escort vehicle) requirements:

Length: if overall length exceeds 85′ you are required to have 1 pilot car (escort). If overall length exceeds 100′ you are required to have 1 front and 1 read pilot car (escort).

Width: If 10′ to 12′ wide you will be required to have 1 pilot car (escort vehicle). If width exceeds 12′ and up to 14′ you are required to have 1 front and 1 rear pilot car (escort vehicle). From 14′ to 18′ in width you will be required to have 3 pilot cars. 2 front on 4 lane and 2 rear on 2 lane roads with the additional at either end. 18′ up to 22′ in width will require 4 pilot cars (escorts); 2 in front and 2 on the rear. If over 22′ in width you will be required to “close and roll” (closing the road as you move) requiring you to have 5 pilot cars as well as a minimum of 1 police escort.

Weight: You may be required to have a pilot car/cars if you are not able to maintain the minimum speed limit and on some designated bridge crossings depending on your weight class.

Overhang: If overhang is greater than 20′ you will be required to have 1 pilot car vehicle. If over 35′ you will be required to have 1 front and 1 rear pilot car.

Required shipment markings & flags.

Truck, trailer and shipment required signs, banners & flags:

For loads that are over 8′ 6″ in width you will be required to have a “OVERSIZE LOAD” banner on the front or your truck and on the rear of your truck or load, whichever is most practical. Flags must be a minimum length of 16″ and be safety orange or red in color.

Pilot car certifications & requirements.

Pilot car (escort vehicle) certifications & requirements:

A pilot car must be manufactured  as a passenger vehicle (car, truck, van, etc.) with a manufacturers weight of less than 10,000 lbs. All pilot car drivers must be wearing a safety colored vest, jacket or shirt. All pilot cars must be equipped with a rotating, strobe or flashing amber light visible from 360 degrees from a distance of no less than 500′. Vehicle must have a regulations sized hand help SLOW – STOP sign, safety colored flags of no less than 18″ in either direction, 8 road safety flares, 3 reflective road triangles, a 2-way communication device capable of transmitting at least 10 miles and a type A, B and C fire extinguisher.

Travel times and restrictions.

Travel times and restrictions:

Approved permits are valid for 3-5 days unless otherwise stated. Travel times are from Monday through Saturday at noon during daylight hours – the one half hour before sunrise to one half hour after sunset rule applies. However, vehicles not exceeding 85′ in length, 16’in width or 16′ in height can travel Monday through Sunday during daylight hours only. Travel is NOT permitted on the following holiday weekends: New Year’s Day, Memorial Day, Fourth of July, Labor Day, Thanksgiving Day and Christmas Day.

Areas of high traffic densities are restricted from 7:00-9 AM and 3:30-6:00 PM in certain areas (refer to your permit for documentation). Movement is NOT permitted on Kalifornsky Beach Rd, Kenai Spur highway or the Sterling highway from 6:45-9:00 AM and 2:15-4:30 PM during the school months for shipments in excess of 14′ in width. Ketchikan has restricted movement from 7:00 AM to 8:00 AM and from 12 noon – 1 PM and from 4:30 PM to 6:00 PM.  Glenn and Parks Highways to Palmer and Wasilla between the hours of 6:00-8:00 AM and from 12:30-1:00 PM and from 4:30 until 6:00 PM if over 14′ in width.

Frost and thaw laws.

Frost and thaw laws:

Frost and thaw laws are in effect usually from March 1 until mid June. There are so many roads that have different regulations on thaw laws and frost laws that you absolutely will want to call the Alaska state DOT office at the number below for information. Here’s an example why: any highway might have a set of regulations until you reach a certain mile post, then after that has a whole different set of regulations and there are hundreds of them like this.

Alaska DOT & information.

Alaska state DOT trucking permit contact information:

Division of Measurement Standards Phones:  907-365-1200
Commercial Vehicle Customer Service Center: 800-478-7636
Huffman Business Park
11900 Industrial Way, Building M
Anchorage, AK  99515

Phone help line: 907-365-1200
Toll free within Alaska: 800-478-7636
Fax: 907-365-1204
Permit office hours: 8 AM – 5 PM
PACIFIC STANDARD TIME

Alaska state DOT website with all kinds of permit info, forms, manuals, etc here.
Road closures and highway conditions here.
Alaska road closure information.

The information contained in these pages is research information primarily for use by oversize and overweight trucking company drivers, dispatchers and pilot car companies. While every effort is put into maintaining the accuracy of this information you must absolutely verify this information with the Alaska State DOT Permits office before commencing movement.
Alaska DOT

Alaska DOT

Alaska state rules and regulations.

Alaska state regulations.

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