UPDATE (6:35 p.m.) - Both southbound lanes have reopened. Traffic remains slow through the area.
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(6:25 p.m.) - A two-car crash was causing a traffic backup for southbound Highway 101 traffic through the Five Cities area on Thursday.
It happened at about 6 p.m. at the Halcyon Rd. offramp in Arroyo Grande.
According to the California Highway Patrol, southbound lanes are blocked and traffic is exiting and re-entering the highway at Grand Ave.
