Several minor collisions are being reported in Essex County.
The OPP is warning drivers of deteriorating road conditions because of the first significant snowfall.
A number of vehicles have also lost control on the 401.
Police say reducing speed and increasing the distance between your vehicle and other vehicles is the best way to avoid a crash.
Meanwhile, the westbound lanes of Laurier Parkway in LaSalle were closed for about an hour between Diotte St. and Malden Rd for a construction vehicle on its side Monday morning.