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3:48 p.m.: The Arapahoe County Sheriff's Office says that both directions of County Line Road are now closed. The eastbound direction is closed at Colorado Blvd. and westbound is closed at Holly. The sheriff's office said it expects the roads to be closed for "several hours." The alternate routes include C-470, Dry Creek and University.
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3:27 p.m.: Arapahoe County sheriff's deputies shut down westbound County Line Road near Holly Road in Centennial after a driver rear-ended a dump truck and died. The sheriff's office says WB County Line Road will be closed for several hours.