101 Express Lanes Construction Update

Pile Driving Complete! Construction crews have finished pile driving in/near the cities of San Mateo, San Carlos, and Belmont. No further pile driving for the project is anticipated at this time. Thank you for your patience and understanding throughout this process! 

Construction Update – Week of January 24th

South of Whipple Avenue: This week, construction activities on U.S. 101 from San Antonio Road (in Palo Alto) to Whipple Avenue (in Redwood City) will include overhead sign work and minor construction activities.

North of Whipple Avenue: This week, construction activities on U.S. 101 from Whipple Avenue to I-380 (in South San Francisco) will include continued work near the removed sound wall along Bayshore Boulevard (from 2nd Avenue to Dore Avenue) within the City of San Mateo; installation of stormwater drainage systems, overhead signs, permanent concrete barrier, weigh-in-motion systems for measuring axle and vehicle weights, and guardrail; grading; paving; shoulder and roadway excavation; stormwater drainage system maintenance; erosion control work; landscaping work; concrete demolition; and other related construction activities.

Most of the work will occur on the freeway lanes, shoulders, and ramps, while sound wall work will occur on city streets adjacent to U.S. 101. More information is provided below.

Construction crews demolishing concrete to create a new section of roadway

Construction crews demolishing concrete to create a new section of roadway

Sound Wall Work: Construction crews working on the sound wall on Bayshore Boulevard, from 2nd Avenue to Dore Avenue in the City of San Mateo, continue to implement periodic traffic control from 8:00 AM to 5:00 PM, Monday through Friday. Watch for detour signs. After 5:00 PM, the road will be restored to two-way traffic. We estimate this work will conclude in late February.

Nighttime Freeway Lane Closures: Nightly freeway lane closures may occur on northbound and southbound U.S. 101 from 7:00 PM to 6:30 AM, Sunday night to Friday morning. Due to low traffic volumes, project-related traffic delays are anticipated to be minimal. Caltrans continues to monitor the flow of traffic and make adjustments, as necessary.

Freeway Ramp Closures: Temporary ramp closures may occur during the night. Ramp closures could occur in both the northbound and southbound directions of the freeway. However, consecutive interchanges for northbound and southbound ramps will not be closed at the same time.

Nighttime ramp closures: Short-term nighttime ramp closures are possible the week of January 24th (between Sunday night and Friday morning) in/near the cities of Redwood City, San Carlos, Belmont, San Mateo, Foster City, Burlingame, Millbrae, San Bruno, and South San Francisco at the following locations (listed from south to north). Changeable message signs near the ramps will have exact closure times and locations.

South of Whipple Avenue:
 Eastbound/Westbound Seaport Boulevard, Northbound U.S. 101 On-Ramp

North of Whipple Avenue: 

  • Eastbound Whipple Avenue, Northbound U.S. 101 On-Ramp
  • Eastbound/Westbound Holly Street, Southbound U.S. 101 On/Off-Ramp
  • Southbound U.S. 101, Eastbound/Westbound Ralston Avenue Off-Ramp
  • Westbound East Hillsdale Boulevard, Southbound U.S. 101 On-Ramp
  • Southbound U.S. 101, Eastbound/Westbound East Hillsdale Boulevard Off-Ramp
  • Eastbound Route 92, Southbound U.S. 101 Connector Ramp
  • Eastbound/Westbound Fashion Island Boulevard, Northbound U.S. 101 On-Ramp
  • Northbound U.S. 101, Eastbound/Westbound Route 92 Connector Ramp
  • Southbound U.S. 101, Eastbound/Westbound Route 92/Fashion Island Boulevard Connector Ramp
  • Eastbound/Westbound 3rd/4th Avenue, Northbound U.S. 101 On-Ramp
  • Northbound U.S. 101, Eastbound/Westbound 3rd Avenue Off-Ramp
  • Southbound U.S. 101, Westbound 3rd Avenue On/Off-Ramp
  • Northbound U.S. 101, Peninsula Avenue On/Off-Ramp (Closures possible starting at 6:00 PM and lasting until 7:00 AM at this location)
  • Northbound U.S. 101, Northbound Broadway & Old Bayshore Off-Ramp
  • Eastbound/Westbound Millbrae Avenue, Northbound U.S. 101 On-Ramp
  • Southbound U.S. 101, Eastbound/Westbound Millbrae Off-Ramp
  • Northbound U.S. 101, SFO Off-Ramp
  • Southbound U.S. 101, Southbound SFO Off-Ramp
  • Airport Boulevard, Northbound U.S. 101 On/Off-Ramp
  • Eastbound/Westbound I-380, Northbound U.S. 101 Connector Ramp
  • Southbound U.S. 101, Produce Avenue/Airport Boulevard Off-Ram
Nighttime ramp closures:
  • Will be displayed on changeable message signs within the construction zone
  • Will begin after 7:00 PM and reopen by 6:00 AM, unless otherwise noted above
  • Will have detour signs posted

Upcoming Construction (South of Whipple Avenue): Construction activities in the coming weeks on U.S. 101 from San Antonio Road (in Palo Alto) to Whipple Avenue (in Redwood City) will include the installation of variable toll message signs; erosion control work; and other minor construction activities.

Upcoming Construction (North of Whipple Avenue): Construction activities in the coming weeks on U.S. 101 from Whipple Avenue to I-380 (in South San Francisco) will include continued work on the removed sound wall in the City of San Mateo; the installation of guardrail, weigh-in-motion systems for measuring axle and vehicle weights, stormwater drainage systems, electrical cabinets, and permanent concrete barrier; shoulder excavation; grading; paving; temporary restriping; overhead sign work; landscaping work; and other minor construction activities.

All construction activities are subject to change without notice.

Visit our website at 101express.com for more information about the project. Follow us on Twitter @CaltransD4.

If you would like a copy of a prior construction update, please email 101express@dot.ca.gov.

If you would like a copy of a prior construction update, please email 101express@dot.ca.gov.