Motorists on Highway 101 in Atascadero can expect delays of up to five minutes overnight for the next three months as crews detour vehicles off closed sections of the highway.
The closures, which began Monday night, will be in place Mondays through Thursdays from 10 p.m. to 5 a.m. each day.
The work is part of the Highway 101 Atascadero Rehabilitation Project, which includes repaving 11 miles of Highway 101 from north of the Cuesta Grade to Traffic Way.
Motorists heading north on Highway 101 will be detoured to the Highway 41 exit before continuing to the Rosario Road on-ramp.
Motorists going south on Highway 101 can exit at Traffic Way, drive south on El Camino Real and re-enter Highway 101 at the Highway 41 interchange.
The northbound and southbound closures will not occur at the same time, officials said. Various on- and off-ramps will also close and re-open during this leg of work, but Caltrans will post notices before those occur.
The entire $41.2 million rehabilitation project includes widening of bridges at Santa Margarita Creek, Atascadero Creek and Traffic Way, as well as resurfacing several on-ramps.