Snow moved through the area early Thursday and was expected to shift east throughout the morning, ABC 7 Chicago meteorologist Greg Dutra said.
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As a result of the snow and cold temperatures, icy conditions were present on Chicago-area roadways, especially those south of the city and near the northwest Indiana border.
Illinois State Police said they responded to dozens of weather-related crashes on Interstates 57, 94 and 80 and Route 394 Thursday morning, and the incidents were well into the double digits as of 5:30 a.m.
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A crash at 394 near Route 30 caused about a 2-mile backup.
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Some vehicles ended up in ditches off the roadways, as well, resulting in a large Illinois Department of Transportation and ISP response.
The crashes slowed traffic but did not cause any closures.