**Detours:**
🔄 San Antonio On-Ramp: US-101 southbound, exit at Atherton, re-enter northbound.
🔄 San Antonio Off-Ramp: Exit at Petaluma Blvd, then backtrack.
🔄 De Long On-Ramp: Use Northbound Redwood Blvd to Atherton Ave.
Plan your route accordingly! #US101#MarinCounty