Wednesday was a dangerous travel day across southern Ontario, as persistent snow squalls throughout the day greatly reduced visibility, leading to several road closures and accidents. Drivers are being urged to consider to postponing non-essential travel until conditions improve Thursday morning.

One of the collisions occurred Wednesday morning, when Wellington County Ontario Provincial Police (OPP) stated two people were sent to hospital with serious injuries following a head-on collision on Highway 6 near Arthur.

For the latest road closures, click here.

SEE ALSO: Ontario: Snow squalls to taper off Thursday, but the bitter cold will continue

"There is reduced visibility due to snow squalls. Avoid the area and if you do not need to travel - stay home," the OPP tweeted, adding that Highway 6 between Side Road 9 and Side Road 10 had been closed for the investigation.

WellingonOPP on scene of a serious MVC involving a sedan and SUV on Hwy 6 north of Arthur. Both drivers were transported to local hospital with serious injuries. There is reduced visibility due to snow squalls. Avoid the area and if you do not need to travel - stay home.^cr

OPP West on Twitter

EARLY TASTE OF WINTER CREATES HAVOC IN ONTARIO

Drivers: take care on Highway 401 between Putnam and Ingersoll. Our Provincial Communications Centre is reporting 6 crashes involving multiple vehicles in that area in both the EB and WB lanes. Slow down and give yourself extra time to get home tonight. ^dr

OPP West on Twitter

Wednesday was the third day of lake-effect snow for southern Ontario with some hefty snowfall totals expected by Thursday morning. Lake-effect bands off of Lake Huron and Georgian Bay targeting Huron-Perth, Barrie, and parts of southwestern Ontario could drop as much as 30 cm of snow by the time they diminish Thursday morning.

And through the squall we go. Near Ingersoll/Putnam. @weathernetwork #onstorm https://t.co/2RHyGvASyU

Mark Robinson on Twitter

Bowmanville Avenue, poor visibility #onstorm

Briar Jamieson on Twitter

Video of a crash outside of #ldnont due to the weather #onstorm if you don't have to drive don't. https://t.co/ThwqglBavf

J P on Twitter

Driving conditions have deteriorated with the onset of more snow squalls. Slow down, leave extra stopping distance and use full lighting system. Wherever you are going, you will need extra time. #DriveSafe #ONstorm https://t.co/vOLx7oJaHg

South Simcoe Police on Twitter

I am told that it's actually a pretty nice day back in mccord..... #onstorm keeping calves fed and bedded in this 💩 weather #ontag #fromthefarm

Tina Verschaeve on Twitter

Thumbnail courtesy of Mark Robinson.

WATCH BELOW:WHITEOUT CONDITIONS AS SEEN IN THIS POV VIDEO FROM BARRIE, ON