PITTSBURGH (KDKA) – Cars and trucking were left stranded on area highways as steady snow and coated roads made for some dangerous driving conditions south of the Pittsburgh Monday morning.

While the snowplows and salt trucks were out, crews had a tough time keeping up with Mother Nature.

Trinity High School just off Route 18 Washington County is closed today. They made the decision to close after consulting Pennsylvania State Police.

The roads were bad enough that a tractor- trailer became stuck on Route 18 near the high school.

According to KDKA-TV Meteorologist Dennis Bowman, 4 to 6 inches of accumulation has been experienced in parts of Greene, Fayette and Westmoreland Counties and across the line into West Virginia.

The snow also forced California University of Pennsylvania and West Virginia University to cancel classes for today.

It was a messy Monday morning commute for people across the area as snow moved in just in time for rush hour.

The snow started falling late last night in counties south of Pittsburgh.

By early this morning, many roads were covered.

Around 3 a.m. drivers on Interstate 79 could not see the lines in the road.

PennDOT was out in full force salting and plowing, but crews had trouble keeping up.

There were a number of accidents around the area as a result of the conditions.

Emergency crews were called out for a jack-knifed tractor-trailer.

It happened along I-79 near Interstate 70 in South Strabane Township. The crash forced traffic to slow.

There was another crash on I-79 on the northbound side of the road between the Prosperity and Amity interchanges.

At least one car was involved and slick conditions were reported all throughout that region.

While more snow fell in the locations closer to the Mason-Dixon Line, drivers near the city still had issues.

Now, drivers are hoping for a smoother commute on Tuesday.

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