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Prince Edward Island Frost Laws

2020 Prince Edward Island frost laws, seasonal load weight and speed restrictions.

Spring frost laws and weight restrictions for Island roads will begin at 12:01 a.m. on Friday, March 15, 2020.

For Prince Edward Island all weather roads, such as routes 1 and 2: Vehicles may carry up to their maximum allowable weight with no overweight exceptions permitted. Other roads: Vehicles may carry 75 percent of their maximum allowable weight during frost law (thaw law) season. Only the road’s posted weight limit is permitted and if the laws are not observed a fine may be levied.

It is important for truck drivers and trucking company dispatchers to make certain they are operating in accordance with the Prince Edward Island posted frost laws, seasonal load weight and speed restrictions that are posted. Changes to these restrictions is subject to change hourly during the winter and spring months. You are expected to be aware of these changes and operate accordingly. It is possible that heavy fines may be levied as well as your truck being ordered out of service and not permitted to travel. We suggest you bookmark this page for future reference.

Seasonal weight restrictions limit the maximum weight of vehicles allowed to travel on certain roads as a way to help prevent damage and protect investment in the roadways.

Late winter and early spring driving in this province has its own set of challenges. Previously frozen roads become more vulnerable to damage as they thaw out and soften. Heavy vehicles travelling over paved roads can make it worse by causing the pavement to crack and break up.

What is frost law and why are they necessary?

When pavement thaws during the daytime and freezes at night it is potentially damaging to the road. In order to prevent this “frost laws” are implemented in order to prevent costly damages to the road.

How are roads damaged by frost thawing or the road freezing?

Water from melted ice and snow seeps into cracks in the pavement and softens the gravel underneath. When the water beneath the surface freezes again, it expands and breaks the pavement, causing potholes. If ice continues to form under the pavement from a steady supply of water, it can push the entire surface of the road upward causing the washboard like unevenness (ripple) known as “frost heaving.” These damages are permanent and costly to repair.

Why are Prince Edward Island roads more vulnerable to seasonal damage?

Prince Edward Island consists of a high concentration of silty soil which collects and holds more water beneath the roadway surfaces, making the roads more susceptible to frost heaving and potholes despite any drainage measures that have been put into place.

What are the classifications of roads under weight restrictions?

  • All-weather roads, such as routes 1 and 2: Vehicles may carry up to their maximum allowable weight – with no overweight exceptions permitted.
  • Other roads: Vehicles may carry 75 percent of their maximum allowable weight.
  • Posted weight limits: Only the road’s posted weight limit is allowed.

Contact information:

Department of Transportation, Infrastructure and Energy
3rd Floor, Jones Building
11 Kent Street,
P.O. Box 2000,
Charlottetown, PE C1A 7N8

Phone: 902-368-5100
Fax: 902-368-5395

If you have questions about the frost/thaw laws as well as any other road related inquiries send a e-mail to: roads@gov.pe.ca

Prince Edward Island Seasonal Weight Restrictions:

https://www.princeedwardisland.ca/en/information/transportation-infrastructure-and-energy/seasonal-weight-restrictions

Learn about frost laws in other Canadian provinces.

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