Sig Alert, 210 Freeway, Rancho Cucamonga 5:55 a.m.

A travel trailer overturned on the westbound 210 Freeway, backing up traffic for miles. The California Highway Patrol said a truck hauling the trailer was heading west on the 210 east of Archibald Avenue at 5:55 a.m. when the trailer tipped over. The CHP issued a Sig Alert and shut down the carpool, fast lane and one additional lane. The Sig Alert was expected to remain in effect until about 9 a.m. As of about 8 a.m., traffic had backed up at least three miles.