(Cleveland) — Most of Ohio was slammed with another heavy snowfall overnight, closing dozens of schools and creating hazardous driving conditions.

During an hour-long ride with the Ohio State Highway Patrol, we came across a dozen crashes. Most were just minor spin-outs.

"The main cause of the crashes today would be unsafe speed," said Sgt. Vincent Shirey.

He says the key to avoiding a crash is simply slowing down and adjusting your speed for the road conditions. You also want to leave extra stopping distance.

While it's not illegal to drive with snow on your vehicle, Shirey suggests cleaning it off before leaving. It can be a safety issue.

"As you're driving down the freeway the vehicle behind you isn't getting caught with all the ice and snow and chips falling from your vehicle hitting their vehicle," he said.

Roads are improving across Ohio. Most of the major interstates and highways are plowed down to the pavement, but conditions are slushy and icy in spots.

Road conditions were much worse the further south and west you went from Cleveland.

A winter storm warning is in effect for the Cleveland area until 5 p.m. Wednesday.

To check school closings, as well as other cancellations through the day, click here.

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