Multiple lanes on the westbound 91 Freeway in Yorba Linda are closed Monday morning after a jackknifed semi-truck. The California Highway Patrol has issued a Sig Alert on the 91 freeway at the 241 ...

A jackknifed big rig shut down several westbound lanes of the 91 Freeway in Yorba Linda. The incident, which occurred just after 4 a.m., also involved the big rig's camper catching fire.