101 Express Lanes Construction Update

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Construction Update - Week of July 25th

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 and shoulders 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 involve work in the median, shoulders, freeway lanes, and on city streets, and will include constructing a new median barrier, repaving the freeway surface, installing permanent roadway signs, PG&E and AT&T service work, 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.
Current Project Work by Roadway Section.

Median 101 Project
A section of the freeway median currently under construction

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 July 25th – Week of August 8th), work in the median may include:
• installing overhead lighting, sign foundations, overhead signs, new permanent concrete barriers, and electrical systems;
• painting new concrete barriers for aesthetic purposes;
• installing and testing fiber optic connections for tolling equipment; and
• reconfiguring stormwater drainage systems to create space for the new express lanes.

mvp 101 project

Construction crews installing new guardrail adjacent to a new maintenance vehicle pullout area 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 lanes, connect auxiliary lanes to create a new lane, and replace freeway signage.

In the coming weeks (Week of July 25th – Week of August 8th), work in the shoulder may include:
• installing permanent roadway signs on northbound U.S. 101 from SR-92 in San Mateo to approximately I-380 in South San Francisco and on southbound U.S. 101 from Broadway in Burlingame to approximately I-380 in South San Francisco;
• installing guardrail just north of I-380 in South San Francisco; and
• installing erosion controls on northbound and southbound U.S. 101.

Paving 101 Project

Construction crews repaving the freeway lanes north of Broadway

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 July 25th – Week of August 8th), crews will close freeway lanes as needed to continue to repave the roadway surface from Broadway in Burlingame to approximately I-380 in South San Francisco. Repaving on southbound U.S. 101 in this section is complete, and construction crews have transitioned to repaving northbound U.S. 101. We anticipate this work will be completed by the end of August. Additionally, crews will be temporarily restriping the lanes on southbound U.S. 101 from Millbrae Avenue in Millbrae to just north of Peninsula Avenue in San Mateo.

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, Sunday night to Friday morning.

Ramp 101 Project
Newly installed erosion control measures adjacent to a freeway on-ramp

Ramps: 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 a list of planned ramp closures.

Streets 101 project
A sign marking a temporary closure implemented on city streets by construction crews

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 San Carlos, San Mateo, and San Bruno. Nearby residents and travelers can expect to see crews from 8:00 AM to 5:00 PM, Monday through Friday. This work may produce intermittent low vibrations and construction vehicle noise, and may 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. PG&E and AT&T service interruptions are not anticipated as part of the Project.

Freeway Ramp Closures: Short-term nighttime ramp closures may occur at the following locations (listed from south to north) during the week of July 25th in/near the cities of Redwood City, San Carlos, Belmont and Foster City. Changeable message signs near the ramps will display exact closure times and locations.
• Eastbound Whipple Avenue, Southbound U.S. 101 On-Ramp
• Westbound Whipple Avenue, Southbound U.S. 101 On-Ramp
• Eastbound/Westbound Holly Street, Southbound U.S. 101 On/Off-Ramp (Closures possible lasting until 8:00 AM on Saturday, July 31st at this location)
• Southbound U.S. 101, Eastbound/Westbound Ralston On/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.

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

101 Express Lanes Construction Update

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