2021-06-20-101-express-update

Caltrans is constructing express lanes on U.S. 101 from the San Mateo County/Santa Clara County Line to I-380 in South San Francisco. Express lanes are expected to open from the San Mateo County/Santa Clara County Line to Redwood City in late-2021 and from Redwood City to I-380 in late-2022.

Construction Update – Week of June 20th

**Note: Caltrans continues to monitor the flow of traffic and adjust freeway ramp and lane closure times as necessary. Additionally, ramp and lane closures may take place from Friday night, June 25th to Saturday morning, June 26th this week. See “Freeway Lanes” and “Ramps” below for more information.

This week, construction activities on U.S. 101 from San Antonio Road (in Palo Alto) to Whipple Avenue (in Redwood City) will involve work in the median, shoulders, and on city streets and will include installing tolling equipment, and landscaping and erosion control work. Construction activities on U.S. 101 from Whipple Avenue to I-380 (in South San Francisco) will include work in the median, shoulders, and on city streets and will include constructing a new median barrier, repaving the freeway surface, installing permanent roadway signs, and landscaping and erosion control work. Construction activities may occur during the day or night, and construction-related noise (e.g. backup alarms, hammering, etc.) should be anticipated.

Construction crews placing rebar in the freeway median

Construction crews placing rebar in the freeway median

Median: Construction crews are working in the freeway median (inside) to install new express lane signage, lighting, and tolling equipment; and construct a taller barrier.

In the coming weeks (Week of June 20th – Week of July 4th), work in the median may include installing overhead lighting, sign foundations, new permanent concrete barriers, electrical systems, and temporary loop detectors for monitoring traffic volumes; reconfiguring stormwater drainage systems to create space for the new express lanes; grading, paving new freeway surfaces; and asphalt/concrete demolition and grinding.

Construction crews paving in the freeway shoulder

Construction crews paving in the freeway shoulder

Shoulders: Construction crews are working in the freeway shoulders (outside edge) to install electrical infrastructure for the new express lanes, remove vegetation, restore existing auxiliary lane and connect auxiliary lanes to create a new lane, and replace freeway signage.

In the coming weeks (Week of June 20th – Week of July 4th), work in the shoulder may include the installation of permanent roadway signs on northbound U.S. 101, concrete barriers around the overpass foundations at U.S. 101/3rd Avenue electrical boxes to support lighting and tolling infrastructure for the future express lanes, and erosion and vegetation control work.

Construction crews working in the freeway lanes to install a new overhead sign

Construction crews working in the freeway lanes to install a new overhead sign

Freeway Lanes: Construction crews are working in the freeway lanes to repave and restripe the roadway, replace overhead signs, and install electronic detectors to monitor traffic flow.

In the coming weeks (Week of June 20th – Week of July 4th), work on the freeway lanes may include grinding and repaving of the roadway surface.

Freeway lane closures are implemented for the safety of crews and nearby travelers during construction activities. Closures may occur on northbound and southbound U.S. 101 from 9:00 PM to 5:30 AM, Monday night to Friday morning, and from 9:00 PM to 8:00 AM Friday night to Saturday morning.

Photo from the Northbound Hillsdale Boulevard on-ramp after completion of work in the area

Photo from the Northbound Hillsdale Boulevard on-ramp after completion of work in the area

Construction crews are working on freeway ramps to accommodate new express lane infrastructure. Ramp closures are typically implemented to facilitate work on or adjacent to freeway ramps.

Temporary ramp closures in both the northbound and southbound directions of the freeway may occur during the night, from Monday night to Saturday morning. However, consecutive interchanges for northbound and southbound ramps will not be closed at the same time. See Freeway Ramp Closures below for more information.

Construction crews implementing one-way traffic control on Bayshore Boulevard

Construction crews implementing one-way traffic control on Bayshore Boulevard

City Streets: Project crews continue to work on city streets to connect the new express lanes infrastructure to the existing PG&E and AT&T grids.

This week, work to connect power to overhead signs and freeway lighting may occur on streets in the cities of Redwood City, San Carlos, San Mateo, San Bruno, and South San Francisco. Nearby residents and travelers can expect to see crews from 8:00 AM to 5:00 PM, Monday through Friday. This work will produce intermittent low vibrations and construction vehicle noise, and will also require temporary lane closures (one-way traffic). Cones and flaggers will safely direct traffic around closures. This work will also include PG&E installing new service locations and meters on city streets adjacent to the freeway.

Freeway Ramp Closures: Short-term nighttime ramp closures may occur at the following locations (listed from south to north) during the week of June 20th in/near the cities of Redwood City, San Carlos, Burlingame, Millbrae, San Bruno, and South San Francisco. Changeable message signs near the ramps will have exact closure times and locations.

Short-term nighttime ramp closures may occur at the following locations (listed from south to north) during the week of June 13th (between Sunday night and Friday morning), in/near the cities of Redwood City, San Carlos, Belmont, San Mateo, Millbrae, and San Bruno. Changeable message signs near the ramps will have exact closure times and locations.

Southbound U.S. 101, Eastbound/Westbound Route 84 Connector Ramp
Eastbound Whipple Avenue, Northbound U.S. 101 On-Ramp
Eastbound Whipple Avenue, Southbound U.S. 101 On-Ramp
Northbound U.S. 101, Whipple Avenue Off-Ramp (Closures possible at this location starting at 8:00 PM on Friday, June 25 and lasting until 9:00 AM on Saturday, June 26)
Westbound Whipple Avenue, Northbound U.S. 101 On-Ramp
Brittan Avenue, Southbound U.S. 101 On-Ramp
Southbound U.S. 101, Eastbound/Westbound Brittan Avenue Off-ramp
Eastbound/Westbound Holly Street, Southbound U.S. 101 On/Off-Ramp
Southbound U.S. 101, Eastbound/Westbound Millbrae Avenue Off-Ramp
Outhbound U.S. 101, Southbound SFO Off-Ramp
Eastbound I-380, Southbound U.S. 101 Connector Ramp
Westbound I-380, Southbound U.S. 101 Connector Ramp
Southbound U.S. 101, Produce Avenue/Airport Boulevard Off-Ramp

Nighttime ramp closures:

Will be displayed on changeable message signs within the construction zone
Will begin after 8:00 PM and reopen by 6:00 AM, unless otherwise noted above
Will have detour signs posted

All construction activities are subject to change without notice.

For questions during construction, contact the Caltrans Public Information Officer:

Alejandro Lopez at (510) 385-6856 or 101express@dot.ca.gov.

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

2021-06-20-101-express-update

Construction Update – Week of June 20th

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

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