article_snippet.sent: A tow truck driver works to clear the scene of a multi-vehicle pileup  on U.S. Highway 36, Friday near Boulder,
article_snippet.sent: Colo. A car is stuck under a semi tractor trailer at the scene of a multi-vehicle pileup  on U.S. Highway 36 .
article_snippet.sent: A tow truck driver works to clear the scene of cleanup on the pileup  on .
article_snippet.sent: Drivers of damaged cars wait at the scene of a multi-vehicle pileup .
article_snippet.sent: A driver stands amid vehicles involved in an accident on wrecked cars .
article_snippet.sent: Emergency personnel and tow truck drivers work to clear the scene of a multi-vehicle pileup .