The Perth County OPP is urging drivers to respect snow plows after a crash near Listowel.
Police say it happened Saturday night on Line 86.
A 23-year-old driver lost control and rolled his car after trying to pass a snow plow.
The driver and a 4-year-old boy were treated for minor injuries at the hospital.
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A 24-year-old woman who was in the car had major, non-life threatening injuries.
All three are from North Perth.
The driver has been charged with careless driving.