Environment Canada has since ended the fog advisory for parts of Simcoe County Thursday morning.
The weather agency said persistent fog has led to near-zero visibility in Barrie, Collingwood and Hillsdale.
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The conditions are expected to dissipate later in the morning.
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Environment Canada warns drivers that travel is expected to be hazardous due to reduced visibility in some locations.
If visibility is reduced while driving, turn on your lights and maintain a safe following distance, the weather agency suggests.
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