UPDATE (9:13 a.m.) - Caltrans says both lanes of Southbound Highway 101 are now open. The overnight work will continue this week.
ORIGINAL STORY: Road work is causing traffic delays Monday on a portion of Highway 101 in Atascadero.
A SIG Alert was issued at around 8:42 a.m. for the southbound lanes near the Del Rio Road offramp.
Last week, Caltrans warned drivers in northern San Luis Obispo County to expect traffic delays on Highway 101 starting this week.
Crews are working to replace concrete pavement at five locations along the highway, between the Highway 58 interchange in Santa Margarita and Traffic Way in Atascadero.
Roadwork is scheduled for Monday through Thursday, between 7 p.m. and 7 a.m.