Caltrans is closing the Price Street ramp off Highway 101 for maintenance Sunday night.
Crews will be retrofitting and improving the rock slope protection on the Pismo Creek Bridge, south of the Hinds Avenue crossing.
The ramp at Price Street will be closed from 7 p.m. until 6 a.m.
Drivers heading southbound can use the on-ramp near Dinosaur Caves Park.
This project is expected to be completed by December, weather permitting.
Caltrans wants to remind drivers to move over and slow down when driving through highway construction zones.