Notice Cause
Construction
Notice Effect(s)
Detour
Lane Closure
Noise
Traffic Delays
Start Date
End Date
What
VTA is continuing construction on the US 101/SR 25 Interchange Phase 1 Improvements Project. South County drivers should prepare for overnight ramp closures beginning Wednesday, March 11.
Nightly Ramp Closures
Beginning Wednesday, March 11, 2026
8:00 PM – 6:00 AM (Overnight Only)
Closures will continue into the following week.
The following ramps will be CLOSED overnight:
- Southbound US 101 On-Ramp from SR 25
- Southbound US 101 Off-Ramp to SR 25
Detours will be in place. Motorists are advised to:
- Allow extra travel time
- Follow posted detour signs
- Drive cautiously through the work zone
All ramps are expected to reopen by 6:00 AM each morning.
Why
What Work Is Taking Place?
Day Time Work:
- Crews will be working on building the new bridge.
- They’ll be doing major structural work on the new connector roadway.
- Workers will install steel reinforcing bars (rebar) and set up forms to pour concrete.
- Construction will continue on the bridge foundations and support columns.
Night Time Work:
- Crews are digging dirt and soil from the hillside located west of the southbound Highway 101 on-ramp.
- The excavated material is being loaded onto trucks.
- The trucks are moving the dirt to the construction area for the new SR 25 Separation Bridge.
- The dirt is being used to build up the raised roadway (embankment) that will support the new bridge
Detour
Detour Routes
Detour Route for Overnight closure of the US 101 southbound on-ramp:
- Continue north on SR 25
- Follow detour signs onto Monterey Road
- Reconnect to southbound US 101 at the Monterey Road interchange
(Detour Route Map for SR 25 to the southbound US 101 on-ramp closure)
Detour Route for Overnight closure of the US 101 southbound off-ramp:
- Continue South on US 101 to Betabel Road
- Betabel Road to Northbound US 101
- Northbound US 101 to Southbound SR 25
(Detour Route Map for southbound US 101 off-ramp to SR 25 closure)
Traffic Impacts
What Drivers Should Expect
- Overnight detours near the US 101/SR 25 interchange
- Possible nighttime construction noise
- Visible crane and bridge construction activity
Subscribe to Stay Informed
Traffic conditions may change due to weather or construction. For updates, visit vta.org/sr25 | Contact VTA Community Outreach at (408) 321-7575 or Email community.outreach@vta.org.