Emergency workers responded to more than 160 crashes in the London area within 24 hours during the first winter storm of the season, police said..
And with snow squalls predicted and temperatures expected to drop, police were bracing for more of the same.
"We need drivers to change their driving habits," said Middlesex OPP Const. Laurie Houghton. If people just slow down we could prevent a lot of the collisions that are happening today."
She urged people to give themselves lots of space between cars.
"Essentially, when drivers are driving too fast for the conditions, we end up dealing with them in the ditch."
Houghton said that's where many vehicles ended up this morning on slick and snow covered highways 401 and 402 in Middlesex County.
Though most injuries appeared to be minor, four people were treated in hospital after a crash in Adelaide-Metcalfe Township early Tuesday.
It occurred just before 8:30 a.m., when a northbound passenger van and southbound car smacked into each other.
All three occupants of the van and the lone occupant of the car were transported to hospital with non-life threatening injuries, police said.
Environment Canada was continuing Tuesday to warn the region faces more snow squalls.
A snow squall watch for London and Middlesex was upgraded to a warning at noon Tuesday. Goderich and Southern Huron County were also added to the warning area.
Environment Canada said snowfall rates in squalls may vary from two to four centimetres per hour. Under the heaviest bands additional snowfalls of 15 centimetres are possible.
The good news for motorists is fall is forecast to return later in the week with temperatures climbing to 9 degrees on Saturday.
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