Highway 154 remains closed in both directions from San Antonio Creek Road to Painted Cave Road, Caltrans announced Thursday.
There is also a soft closure at Highway 192 and at the Highway 154/ Highway 246 Roundabout in Santa Ynez allowing access to local businesses.
Caltrans said the closure is due to roadway cracking extending across all lanes of traffic.
A drilling operation to insert 40-foot dowels into the highway is happening 24 hours a day. Caltrans workers are expected to begin inserting horizontal dowels underneath the highway this weekend. Sub-surface monitors will also be used to observe road movement.
The Department of Transportation says that the section of Highway 154 will not re-open until Caltrans determines the pavement's conditions and safety.
In the meantime, drivers can use Highway 101 and Highway 246.
