TRAFFIC ADVISORY: 4/14-4/17 (Nightly On & Off Ramp Closed with Detours)

Notice Cause
Construction
Notice Effect(s)
Detour
Lane Closure
Noise and Vibration
Traffic Delays
Start Date
End Date

Related

US 101/SR 25 Interchange - Phase 1
What
Traffic map showing the US 101/SR 25 interchange with overnight closures beginning April 14, 2026, from 8:00 PM to 6:00 AM. The southbound US 101 off-ramp to SR 25 and the SR 25 on-ramp to southbound US 101 are closed. Detour routes are highlighted, with directions toward San Jose, Hollister, and Salinas indicated. Construction symbols mark affected areas.

Nightly On & Off Ramp Closures with Detours 4/14 - 4/17

Why

Construction activity continues across multiple areas of the interchange, including roadway reconstruction, bridge work, nightly lane closures, detours, and retaining wall construction.

Detour

Lane Closures / Traffic Impacts

Closures take place Tuesday, April 14, through Friday, April 17, 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

All ramps are expected to reopen by 6:00 AM each morning.

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 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
Community Impacts

Work Locations & Activities

South End (SR 25 / US 101 Interchange Area)

  • Nighttime roadway excavation and hauling operations throughout the week 

North End (Near Castro Valley Road)

  • Roadway reconstruction, including pavement removal and base preparation 
  • Vegetation clearing early in the week 

Bridge & Structure Work (Connector & Interchange)

  • Ongoing construction of bridge supports and columns 
  • Concrete pouring and curing operations 

Retaining Wall Construction

  • Excavation and wall construction activities continue daily 
Traffic Impacts
  • Nighttime construction activity: Monday, April 13 through Friday, April 17 
  • Potential impacts include: 
    • Intermittent lane reductions 
    • Slower traffic through the work zone 
    • Construction lighting and noise at night 
    • Increased truck traffic entering and exiting the site 

Travel Advisory

  • Plan for minor delays, especially during nighttime hours 
  • Use caution when traveling through construction zones 
  • Follow all posted signs and directions from construction crews