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Saskatchewan Frost Laws

2020 Saskatchewan frost laws, seasonal load weight and speed restrictions.

The winter/spring season frost law restrictions will again be in in effect for many roadways in the Province of Saskatchewan this year according to information provided by the the provincial Ministry of Highways and Infrastructure. Typically, seasonal (spring) frost law restrictions that take effect in March.

Spring load restrictions on affected highways: The maximum load on steering axles is 10 kg per millimeter (560 lbs. per inch) width of tire (manufacturer’s stamped dimensions), to a maximum of 3 000 kg (6,612 lbs.) on each wheel but to a maximum of 5,500 kg (12 120 lbs.) on the steering axle; except for straight trucks on primary highways which are allowed up to a maximum of 7,250 kg (15,983 lbs.) on the steering axle with the appropriate tire size.

Maximum loads on all other wheels will be limited to 6.25 kg/mm (350 lbs. per inch) width of tire to a maximum loading of 1,650 kg per wheel (3,636 lbs.)

Maximum gross axle weights and tire sizes.

Colder temperatures during the winter months help freeze and strengthen roads. As a result more weight can be transported on provincial highways without damaging the road. This is a benefit to the trucking community.

The winter weight period that allows additional weight typically runs from November 16 through March 14. However, if weather remains mild the program may be postponed because without sufficient freezing, extra weight can damage pavement and the road beneath.

Winter Weights will not apply in the southwest area of the province until December 1 and will be removed on the last day of February due to historically milder climatic conditions.

Municipal roads are the responsibility of each rural municipality, who can set out their own weight limits. Weights can be restricted at any time by Minister’s order.

Saskatchewan is a large province with considerable difference in climate in the north and the south. The new change takes into account the climatic differences in the north and the south of the province while also maintaining the original intent of providing primary weight access for economic activities. In the north of the province, the annual weight increase on the 9-month primary highways will be same as before, from July 1 to March 31 of the following year. In the south of the province, the annual weight increase on the 9-month primary highways will occur earlier, from June 15 to March 15 of the following year. This change will help to sustain road conditions in the south, where spring thaw occurs earlier.

Additional information can be obtained by contacting the inquiry line: 1-866-933-5290 in Saskatchewan or 306-933-5290 outside the province.

Source: Spring Road Restrictions: https://www.saskatchewan.ca/business/transportation-and-road-construction/information-for-truckers-and-commercial-trucking-companies/regulations-and-road-restrictions/increased-weights-and-road-restrictions

Government of Saskatchewan, winter weight restrictions and spring frost law road bans and interactive road map:




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2020 Frost laws introduction and overview.

2020 Frost laws introduction and overview.

Frost/thaw damages to surface.

Frost/thaw damages to surface.

2020 frost laws, seasonal load weight and speed restrictions by State/Province (USA and Canada).

Section 1. The United States: Restrictions and guidance on seasonal weight restriction laws.

Many states incorporate temporary special weight limits and restrictions (frost laws) during the spring months of the year. These temporary restrictions are usually referred to as “frost laws” and implemented typically during the month or March and April. In some Northern States and Provinces frost laws can still be in effect in July as it’s much colder in the North. Since these restrictions are implemented on a “as needed” basis it is possible many of the official government websites may not have published this temporary restriction in a convenient place as frost laws are also subject to change at any moment based on the temperature of the roads core. You want to be certain to check with the appropriate department officials to verify the latest changes in the laws.

It is very typical for States and Provinces to not be clear about their exact weight requirements during frost law season. This gives them the opportunity to examine each proposal individually on a case-by-case basis to determine if any damages may occur at the time should the shipment be approved. Information may only be available by contacting the SPECIFIC DEPARTMENT. The axle weight limits and spacings are determined by many factors including road conditions, temperature, moisture content in the soil, etc. Note multiple weight limits can be in effect at the exact same time in different parts of the region due to temperature as well as the actual construction of the road.

Visit any of the links below to view state frost laws:

Idaho Iowa Maine Michigan Minnesota  Montana Nevada  New Hampshire  New York North Dakota   Pennsylvania  South Dakota  Vermont Washington  Wisconsin  Wyoming

Section 2. Canada: Restrictions and guidance on seasonal weight restriction laws.

Many Canadian provinces issue spring frost law weight restrictions in the month of March and current Province websites may not be all inclusive of temporary changes in their laws. It is wise to check with the province’s DOT office (or appropriate department) for the most current and latest frost law information.

Visit any of the links below to view province frost laws:

Alberta British Columbia Manitoba New Brunswick Nova Scotia  Ontario  Prince Edward Island Quebec  Saskatchewan

Protection of our roads and highways.

There’s a delicate balance between protecting roadways during the spring thaw. In order to keep the trucking industry operating the Northern US states and Canadian provinces rely on engineers and scientific data to determine which dates frost laws will be in effect. With fairly recent advances in science and technology, data is much more reliable. This helps with the implementation of “Frost Laws” or “Seasonal Weight Restrictions” ensuring they are not implemented to early or late. While no State or Province desires to delay the transportation of goods through their territory it is imperative public assets are protected.

In areas that constantly get negative temperatures the amount of damages has forced Northern US States as well as Canadian Provinces to create and enact laws that restrict vehicle weights during spring months (specifically trucking companies), when the roads and bridges are thawing. There are all kinds of things that can go wrong with different types of roads and pavements. For example the State of Michigan has implemented permanent frost laws that go into effect during the months of March through May (and in some cases even June). Some routes require the legal axle weight limits be decreased by as much as 35%. Some States and local governments may also limit heavy-haul vehicle speeds to a maximum of 35 miles per hour during the frost law months regardless of posted limits.

Most major highways are constructed in 3 layers. The top layer you see or the pavement usually averages about 4″ to 6″ in thickness depending on it’s age. This layer of pavement is supported by 2 more layers. One is called the base layer and the other a sub-base layer. Together these three layers are typically at least 36″ in depth with most much more thicker. For instance in Southern Oregon on old US Highway 1 which follows the coast line from Mexico to Canada the road is a much as 16 feet thick as years of pavement has been laid. It should be noted that today’s technology is able to provide us with roads that are flexible due to the engineering of the construction process and the materials used. Excessive weight exerted by overloaded axles (or a weakened supporting base) can cause the pavement to bend or deform. The strength of the road combined with its resistance to bending determines the amount of weight the roadway can handle.

Road building technology has improved significantly during the last decade. The most obvious winter damage is the occurrence of potholes that are the result of moisture in the pavement freezing and weakening the top layer of the road. However, modern road building materials significantly reduce the amount of moister retained in the top layers, reducing the occurrence of pot holes. The base and sub-base however are still subject varying amounts of moisture that is influenced by rain, run-off and general moisture content during the spring months.

Roadways are built to carry normal maximum axle and gross weights based a certain level of residual moisture in the layers of the road bed. During the normal winters in the northern states and Canadian provinces, water in the soil typically freezes down to depths of a meter or more, preventing excess water from escaping. In fact, some areas in Canada allow up to a 25% increase in axle and gross weights because the solidly frozen base layers strengthen the road structure. During the spring thaw, however, axle and gross weights may be reduced by as much as 35%.

What exactly are frost laws?

Frost laws are seasonal restrictions on traffic weight limits and speeds on roadways subject to thaw weakening.

During the spring thaw, the roadbed is softened by trapped moisture beneath the pavement, reducing the supporting strength of the road to less than the original construction strengths. As the excess moisture evaporates or drains away, the road bed will stabilize and return to normal design strengths.

Because of the variability of temperatures each year States and Provinces must manage maximum weight and speed restrictions on a seasonal basis to both protect and preserve roads and ensure maximum access to trucking interests.

“Seasonal weight restrictions” typically start in early March and continue through mid-June. Since conditions vary from year to year, from below-normal to above-normal temperatures, most states and provinces reserve the authority to adjust spring load restrictions based on observed seasonal rain and temperature conditions, weather forecasts, as well as soil moisture sampling, to determine the dates for setting and removing weight restrictions. Weight restrictions remain in effect until sufficient moisture has escaped and the roadbeds regain stability. The most significant pavement damage occurs during the first four weeks after the onset of spring thaw.

Some states plan seasonal weight restrictions. For example, Pennsylvania schedules restrictions from February 15th to April 15th based on years of weather data. However, they reserve the authority to post additional restrictions due to unforeseen severe weather conditions.

The State of North Dakota has taken a much more different approach. They utilize temperature probes in the base layer sections, long range temperature forecasts, and sensors in the pavement to evaluate the strength of roadway bases to forecast when load restrictions should be imposed or removed.

A review of transportation  departments indicates 16 states have implemented frost laws or seasonal load restrictions. In many states, seasonal weight restrictions are managed by local governments or jurisdictions. Most Canadian provinces also have established spring thaw speed and weight laws.

Note: The strength of a roadway is affected by moisture in the base materials supporting the roadway. The condition of road surface—moisture or frost on the roadway—does not affect roadway strength.

In general, during the spring thaw, maximum axle weights and gross vehicle weights will be reduced as much as 35%. Each state or province has established maximum axle and gross vehicle weights for key national and state trucking routes.

Because these spring load restrictions will vary so widely by state, and even within a state and because seasonal restrictions may be posted on short notice, it is best to check each state’s freeze/thaw laws prior to each trip. Links to seasonal restriction information for each US state or Canadian province are posted above.

Frost laws are created for the States and Providences in the USA and Canada that experience very low temperatures in the winter months frost laws may be enacted.  These frost laws have been created to protect the State of Providences from highway and road damage caused by the surface cracking which is a direct result of too much weight being placed on the pavement which causes stress cracks thus damaging it.  Also, when the freezing temperatures start to thaw out at times the water can not escape quickly which will cause the water to build up which can weaken the base structure of the road or highway which again causes damages the the pavement.  Damages from thawing are just as severe if not even more extreme than frozen damages as they occur to the upper structure of the pavement rather than the base structure.  In some areas during the winter months actual federal weight limits for the trucking industry (80,000 pounds gross) have been reduced with a reduction in driving speeds as well.  This reduction has been observed as high as 35% in weight and even more in maximum speeds.  Some States and Providences close winter and spring travel in certain areas.

It is very important that managers of trucking and transportation companies are aware of the open and closed months, days and times these particular laws are in effect as you can’t make an arrangement with a customer to ship their item if the state will not let you ship it due to frost or thaw laws being in effect. We are creating a contact list (EDIT ADD LINK)  of each state that has frost laws enacted for the trucking industry for you to contact for further information.

It is important for you to check with the DOT, DMV, Port of entry or governing office of that particular area for clarification of the specific rules and regulations.

Illinois State Shipping Regulations for oversize and heavy haul.

Shipping laws, regulations, limitations and rules for shipping oversize and over-weight loads over the roads and highways in the state of Illinois.


The great state of Illinois official seal.

Please share your expertise or knowledge of Illinois state shipping regulations with other visitors below.

Trucking and pilot car location system:
Locate trucking companies and pilot cars in Illinois.

Locate specialized trucking companies in Illinois.
Locate pilot car companies in Illinois.
Order oversize trucking permits.

Legal load limits in Illinois.
Illinois DOT legal load size & weight limitations.

Legal Loads.
Length:  65’ overall length maximum.
Width: 8’6” on interstate and other designated highways, 8’ on non-designated highways.
Weight:  GVW 80,000,  Single 20,000, Tandem 34,000,   Tridem 42,000
Height:  13’6” is the maximum allowed height for legal loads.
Overhang:  3’ front in the front and 3’ off of the rear of trailer.

Routine oversize shipping, trucking and transport permits.
Oversize and overweight trucking permits that are routinely issued by the state of Illinois.

Length:  Up to 145’ long. Anything longer see superload section below.
Weight:  Single 24,000, tandem: 48,000, tridum: 60,000, Quadem: 60,00 gross, 5 Axles 100,000 lbs., 6 Axles 120,000 lbs., 7 axels: 120,000, 8 axles: 120,000 lbs.
Width: 14’6” (any load over 16′ will require special admin approval before permit is issued).
Height: 15’ (any load over 16′ tall requires a route survey).

Superload information:
Illinois DOT superload information.

Length: Any load that is longer than 145′ is considered a superload.
Width: Any load that is in excess of 14′ 6″ in width is considered a superload.
Height: Any load that is in excess of 15′ 6″ in height is considered a superload.
Weight: Any load that exceeds 120,000 lbs on any standard axle configuration whether it’s a 6,7 or 8 axle configuration or not is considered a superload.
Overhang: Contact them as this varies depending on route.
Notes: Spacing between steer and first tandem must be more than 8′ 1″. The spacing before the first axle and the trailer must not exceed 18′ 6″.  All axle spacings combined must not be less than 43′ 6″. Superload permit processing times vary. Expect delays. Before requesting a route you are expected to do as much research on your own as possible. They will refer you to: GettingAroundIllinois for construction zones and other closures. 

Permitted travel times and restrictions in Illinois:
Illinois travel times and restrictions for oversize loads.

Travel is permitted from ½ hour before sunrise to ½ hour after sunset  Monday thru Friday and ½ hour before sunrise until 12PM on Saturdays. Loads that are overweight only may travel 24/7 on all days of the week (make certain it is not documented otherwise on your permit before doing so). No travel is permitted on Sundays unless you are below the routine permit standards of no more than 115′ in length, 12′ in width, 13′ 6″ in height (sunrise to sunset rules apply).  No movement is permitted on the major holidays: New Years Day, Memorial Day, Independence day, Labor Day, Thanksgiving Day and Christmas Day. Travel stops at 12PM on the day before any of these holidays. The Illinois oversize load permit office is closed on MLK Day, Lincolns birthday, Washingtons birthday, Columbus Day, Election Day, Veterans Day and on the day after Thanksgiving. However, travel is not restricted on these days. Always refer to your permit for approved travel times.

Required shipment, truck and trailer markings:
Truck, trailer and shipment required signs, banners and flags.

A rotating amber light must remain on at all times mounted on top of the cab and be visible from 360 degrees from a minimum of 500′ in direct sunlight. If your overall length is more than 80′ in length you are required to have one amber light over the cab of the truck and one amber light no more than 10′ from the rear of end or trailer/load at the highest point that is practicle. Oversize load signs must be a minimum of 7′ in width x 18″ in height, have a yellow background color with black lettering no less than 10″ in height x 1″ thick – we have recently heard 12″ tall x 2″ thick so please clarify and comment below if you know which is correct. Flags are required at all 4 corners of the load and front of truck and are to be safety red in color and no less than 18″ square. Shipments over 75′ in length, 10′ in width or 14′ 6″ in height are required to have signs. Signs must be placed on the front and rear extremities of the truck, trailer or load.

When pilot cars are required:

Length: If over 110′ in length you are required to have a minimum of 1 pilot car and in some places 2 pilot cars (higher traffic density or certain times of year). If over 145′ (150′ in some very rural areas) in length you are required to have 3 pilot cars –  yes 3. If over 175′ in length a police escort will be required.
Width: Up to 14’6” requires 1 pilot/escort vehicle. Over 16’ requires 2 pilot/escort vehicles. Over 18′ in width will require a police escort. 
Height: Up to 14’ 6” 1 pilot/escort vehicle, over 16’ requires 2 pilot/escort vehicles. Over 18′ in height will require a police escort.
Weight: No requirements as long as you can maintain minimum speeds. However on bridge moves that require all other vehicle traffic to be removed will required appropriate number of pilot cars which is a minimum of 2 and possibly 3 with police escort. All areas are different and require evaluation.
Note: If you exceed any two dimensions, then you are required to have an additional pilot car. So if you’re over 14′ 6″ tall and 14′ 6″ wide you would be require to have 2 pilot cars.

Required pilot car certifications:

Cars, vans or trucks may be used as long as gross weight of pilot car vehicle is rated at no more than 8,000 lbs. Pilot car driver must be 18 years of age minimum with a valid regular drivers license. Pilot cars must have a rotating or flashing amber light mounted on the top of the vehicle (no specs as of time of writing 2014). Must display red flag at all 4 outer most points of the vehicle and have “OVERSIZE LOAD” signs that are a minimum size of 5′ wide x 12″ tall and have black lettering no less than 8″ in height. Must have radio and be in constant communication with the driver transporting the shipment at all times. Must have $500,000 per occurrence combined insurance that covers property and body.

How to apply for trucking permits:

Illinois Department of Transportation – DOT
Bureau of Traffic, 2300 S Dirksen Parkway
Springfield, IL  62764

Email: dot.permitoffice “at” illinois.gov
General inquiry phone: 217-782-6273
Phone: 217-785-1477 or 800-252-8636 within the state.
Fax: 217-728-3572

Note: Fee varies depending on dimensions and miles traveled. Permit is valid for 5 days.

Hours: from 8 AM until 4:30 PM

Central Time Zone


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 Illinois State DOT Permits office before commencing movement.


Connecticut State Shipping Regulations

2018 Connecticut state heavy haul and oversize trucking laws, regulations, rules and limitations.

These are the laws, rules and regulations pertaining to heavy haul and oversize loads on the roads and highways in the state of Connecticut. The Commissioner of Transportation or other authority having charge of the operation, repair or maintenance of any highway or bridge is authorized to deny or grant permits for transporting vehicles or combinations of vehicles or vehicles and loads or other objects transported within Connecticut state jurisdiction. With that said heavy haul trucking and oversize trucking within the state of Connecticut is primarily subject to the following regulations, rules and limitations. We do ask viewers such as yourself to mention any variations of this information below. Sharing will immediately notify us and other viewers user so we can immediately update our information if needed. State laws for heavy haul trucking, oversize trucking and pilot car companies is constantly changing. We thank you for your consideration and visiting us.

For heavy haul or oversize shipping including pilot cars.


The great state of Connecticut official seal.


Connecticut state trucking permit regulations; overweight, oversize, heavy haul, wideload, pilot cars.  Shipping and Transport.

Legal Loads.

Length: trailer 48’ (no limit for tractor)
Weight: GVW 80,000 lbs. if configuration complies with federal bridge formula.
Width: 8’6”
Height: 13’6”

Routine heavy haul trucking, oversize shipping and transport permits.
*NOTE: We are not sure if there is anything considered “routine” as far as permits are in this state. They are real picky about issuing permits so nothing can be assumed, you must call and speak with them first. If you have any verifiable information to add to this please submit it below.

Length: 130′ is about the maximum and that depends on routing.
Width: 16′ wide is about the most allowed depending on intended route.
Height: 14′ – possibly more depending on your intended route.
Weight: single axle: 22,500, tandem: 45,000, tridum axles: 67,500, quadem: ?, 5 axles: 122,000, 6 axles: 130,000, 7 axles: 150,000, 8 axles: 160,000.
Notes: Drivable cranes (or self propelled) weight limits. Four axle cranes having a maximum GVW of 110,000 pounds: tandem axle cranes having a maximum of 60,900 lbs. and not more than 23 feet from the center of the first axle to the last axle. Five axle cranes maximum gross vehicle weight of 114,500 lbs. with no more than 30,000 lbs. on a single axle or 45,000 lbs on any tandem axles or 66,100 lbs on tridem axles. Six axle cranes a maximum gross vehicle weight of 115,000 lbs., with no more than 68,200 lbs on tandem axles. No more than 28′ from the center of the first axle to the last axle. Modular and mobile homes  16′ wide M-F travel only with travel time of 11:30 pm until 4:30 am as will be specified on the permit.

Pilot Car – when do you need them?
Width: Over 12’ wide 1 rear (or front and rear if undivided highway). Over 13’ 6” 1 front and one rear escort. Over 15’ 1 front and 2 rear
Height: Over 14’ 1 pilot car in front
Length: Over 80’ 1 pilot car in rear on undivided highway.  If over 100’ one escort vehicle is required in the front and rear of the trailer on undivided highways. On divided only 1 rear is required. If over 119′ one in front and one in rear on undivided highways. Sectional or modular homes 16′ wide maximum. No pilot required until 10′ wide. If 10′ wide then one rear escort is required in undivided highways of if load is wider than lane. From 10′ wide to 13′ 6″ one rear on divided highways and one rear on undivided highways. Over 13′ 6″ in width requires on front and one rear on all roads. If over 80′ in length one rear escort is required on undivided highways. If over 85′ in length then one front and one rear is required on all routes.

Escort Car Requirements.
Your signs must be worded exactly: “Oversize load ahead” or “Oversize load following” depending on if you are leading or chasing. This sign must be a minimum of 48″ above the ground. Or sign must read: “Wideload ahead” or “Wideload following” or “Longload ahead” or longload following” depending on if the pilot car is leading or chasing. All signs mentioned here must have a minimum of 8″ black letters and be on a yellow background. Amber lights must be attached to the top of pilot car or escort vehicle and be visible for no less than 1,000 feet. Your light must either flash or rotate. You must be able to maintain communication with the driver of the load via 2-way radio at all times. You must have a red vest or jacket as well as a red hand flag no less than 18″ square. 18″ square flags are to be mounted on both front or rear corners of the vehicle. All escort vehicles must have a width of at least 60″ and 1 and 1/2 ton capacity for cargo.

Travel Restrictions.
Travel permitted ½ after sunrise to ½ hour after sunset. Loads over 13’6” wide or over 14’ high can travel only Tuesday through Thursday 9 am to 4 pm.

How to Apply for Permits.
Connecticut Department of Transportation (CDOT)
2800 Berlin Turnpike, PO Box 317546
Newington, CT 06131-7546
Website: www.ct.gov/dot
Permits: www.cvisn.ct.gov  (alternative)
Phone: 860-594-2880
Fax: 860-594-2949
Office hours: 8am – 12:30pm and 1:30pm – 4pm EDT, M-F.


Basic permit is 23 bucks plus there’s a 3 dollar fee for faxing the permit.  Permit is valid for 3 days.We’d love to hear from you. Do you have any ideas, questions, comments of concerns? Perhaps you have in-depth knowledge you can share with others. Please don’t be shy as we like to hear from our viewers and our viewers like to hear what others have to say so share it below!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 Connecticut State DOT Permits office before commencing movement.

Connecticut cities: Ansonia, Bantam borough, Bethel, Bethlehem Village, Blue Hills, Branford Center, Bridgeport, Bristol, Broad Brook, Canaan, Canton Valley, Central Manchester, Central Somers, Central Waterford, Cheshire Village, Chester Center, Clinton, Collinsville, Conning Towers-Nautilus Park, Coventry Lake, Crystal Lake, Danbury, Danielson borough, Darien, Deep River Center, Derby, Durham, East Brooklyn, East Hampton, East Hartford, East Haven, Essex Village, Fenwick borough, Georgetown, Glastonbury Center, Groton, Groton Long Point borough, Guilford Center, Hartford, Hazardville, Heritage Village, Higganum, Jewett City borough, Kensington, Lake Pocotopaug, Litchfield borough, Long Hill, Madison Center, Mansfield Center, Meriden, Middletown, Milford city (balance), Moodus, Moosup, Mystic, Naugatuck borough, New Britain, New Hartford Center, New Haven, Newington, New London, New Milford, New Preston, Newtown borough, Niantic, Noank, North Granby, North Grosvenor Dale, North Haven, Northwest Harwinton, Norwalk, Norwich, Oakville, Old Mystic, Old Saybrook Center, Orange, Oxoboxo River, Pawcatuck, Plainfield Village, Poquonock Bridge, Portland, Putnam District, Quinebaug, Ridgefield, Rockville, Salmon Brook, Saybrook Manor, Shelton, Sherwood Manor, Simsbury Center, South Coventry, South Windham, Southwood Acres, South Woodstock, Stamford, Stonington borough, Storrs, Stratford, Suffield Depot, Tariffville, Terramuggus, Terryville, Thompsonville, Torrington, Trumbull, Wallingford Center, Waterbury, Wauregan, Weatogue, Westbrook Center, West Hartford, West Haven, Westport, West Simsbury, Wethersfield, Willimantic, Windsor Locks, Winsted, Woodbury Center, Woodmont Borough