The Highway 101 northbound on- and off-ramps and the southbound off-ramp at Marsh Street will be closed Tuesday from 9 a.m. to 3 p.m. as the city does signal work at the intersection of Higuera and Marsh streets.

The Highway 101 on- and off-ramps at Madonna Road will remain open.

For traffic updates on other state highway projects in San Luis Obispo County, drivers can call Caltrans District 5 Public Affairs at 805-549-3318 or visit http://www.dot.ca.gov/dist05/road_information.htm.