An operation to stripe the Castillo Street undercrossing will take place Monday, April 21 and Tuesday, April 22 during the overnight hours, 9 p.m.-6 a.m., resulting in U.S. 101 ramp closures, Caltrans has announced.

The Hwy. 101 southbound off-ramp at Castillo Street will be shut 9 p.m.-6 a.m. April 21, and the Castillo Street southbound on-ramp will be closed 9 p.m.-6 a.m. April 22.

During the striping operation there will be one-way traffic control on Castillo Street, just north of the Castillo Street undercrossing, Caltrans said.

Flaggers and message signs will assist with traffic control in this work zone. Travelers can expect minor delays.