Watch this Incredible Video of a Multi-Vehicle Pile-Up on a Snow Covered Highway

Wisconsin state police say a multi-vehicle pile-up on a snow covered highway was one of many reported on Sunday as snow and fog overspread the area.

The Department of Transportation released this 5 minute video of the pile-up which involved at least 40 vehicles. Police said 15 people were taken to the hospital, and all but one has been released.

Officials say they are amazed more people weren't seriously hurt in the massive accident which shut down the southbound lanes of U.S 41/45 most of Sunday afternoon. About 2 dozen cars had to be towed away.

The Wisconsin state patrol says it will take "some time" to complete their investigation.