Managed Lanes Coming to the San Francisco Peninsula

State and county officials gathered on Friday to celebrate the start of a $514 million project to convert carpool lanes to express lanes and connect auxiliary lanes to make for a lane addition. The 32-mile project on Highway 101 opens in 2022.

4 minute read

March 13, 2019, 12:00 PM PDT

By Irvin Dawid


San Bruno, California

formulanone / Flickr

"The 101 Express Lane Projects will deliver 32 miles of interrupted express lanes in both directions on U.S. 101 between Interstate 380 in San Bruno and State Route 237 in Sunnyvale," according to the Caltrans media advisory [pdf]. The most challenging part of the project, and its raison d'être, is to construct 14-15 miles of express lanes from Redwood City north to San Bruno, in both directions, where no carpool lanes exist.

Zachary Clark of the San Mateo Daily Journal has been reporting on the twists and turns of the controversial project within San Mateo County since its inception several years ago.

Managed Lanes construction will occur in two main phases. Between March and November of this year, the carpool lanes between the Whipple Avenue exit [in Redwood City south to] the Santa Clara County line will be converted to express lanes with tolling equipment.

Between October of this year and November of 2021, the new lanes will be constructed along with tolling infrastructure between the Whipple Avenue exit [north to] Interstate 380 [in San Bruno].

It's the latter part that is the most challenging as it involves connecting far right auxiliary lanes (that begin and end at entrances and exits, respectively) to create a continuous through lane, and then convert the far left lane into a new express lane that promises to bring relief to the fleets of tech company shuttles ferrying workers to Silicon Valley workplaces from San Francisco and elsewhere. This explains why Google and Facebook contributed funds to the project, along with three sources of public funding:

Dynamic tolling is expected to be applied to solo occupant vehicles using the express lanes which will free for carpools of three or more occupants as well as transit vehicles.

The tolled facility in San Mateo County is expected to generate $10 million to $20 million a year and that money must be reinvested into the corridor.

Part of the plan is to roll out an expanded network of express buses that will use the new lanes and officials hope many solo drivers will commute that way instead.

“We believe this is how you reduce congestion on freeways, by diverting carpools and buses and, if space is available, toll payers to an express lane,” said Maryann Moise Derwin, chair of City/County Association of Governments (C/CAG) and also a Portola Valley councilwoman. 

The two biggest hurdles for officials in the two San Mateo County agencies, C/CAG  and the Transportation Authority, that partnered with Caltrans in the project's planning, dealt with equity, i.e., the regressiveness of charging all solo drivers regardless of income the same toll, and ownership and operation of the express lanes.

The two agencies agreed to split ownership in the form of a joint powers authority and chose the Bay Area Infrastructure Financing Authority, also a joint powers authority between the Metropolitan Transportation Commission (MTC) and the Bay Area Toll Authority, to operate the facility.

The financing authority operates the I-680 Contra Costa Express Lanes which opened in October 2017, and has plans to operate "270 miles of the 600-mile Bay Area Express Lanes network; converting 150 miles of existing carpool lanes to Express Lanes and adding 120 miles of new lanes," according to MTC.

Derwin of C/CAG also saw the project as providing more than just congestion relief for commuters. 

“This is how you change behavior, by encouraging people to drive in carpools or take express buses that fly through traffic. And because this is how you ultimately reduce greenhouse gases, by keeping cars moving at a steady speed.”

Caltrans hopes to continue express lane construction north of San Bruno into San Francisco, a project under consideration by the San Francisco County Transportation Authority.

Related in PlanetizenPublic is Receptive to Plans for Express Lanes on Hwy 101 in Bay AreaDecember 16, 2017

Saturday, March 9, 2019 in San Mateo Daily Journal

portrait of professional woman

I love the variety of courses, many practical, and all richly illustrated. They have inspired many ideas that I've applied in practice, and in my own teaching. Mary G., Urban Planner

I love the variety of courses, many practical, and all richly illustrated. They have inspired many ideas that I've applied in practice, and in my own teaching.

Mary G., Urban Planner

Use Code 25for25 at checkout for 25% off an annual plan!

Logo for Planetizen Federal Action Tracker with black and white image of U.S. Capitol with water ripple overlay.

Planetizen Federal Action Tracker

A weekly monitor of how Trump’s orders and actions are impacting planners and planning in America.

May 7, 2025 - Diana Ionescu

Person in yellow safety suit and white helmet kneels to examine water samples outdoors on a lake shore.

USGS Water Science Centers Targeted for Closure

If their work is suspended, states could lose a valuable resource for monitoring, understanding, and managing water resources.

May 1, 2025 - Inside Climate News

Wide suburban road with landscaped median and light pole banners advertising local amphitheater.

End Human Sacrifices to the Demanding Gods of Automobile Dependency and Sprawl

The U.S. has much higher traffic fatality rates than peer countries due to automobile dependency and sprawl. Better planning can reduce these human sacrifices.

April 29, 2025 - Todd Litman

Wasco Viaduct under construction in California's Central Valley as part of California High-Speed Rail project.

Trump: Federal Government Won’t Pay for California HSR

The President has targeted federal funding for the California bullet train project since his first administration.

May 8 - The Fresno Bee

Bird's eye view of Salesforce Park in San Francisco, CA.

San Francisco Enhances Urban Planning Initiatives with Green Infrastructure

San Francisco incorporates green infrastructure in its city development initiatives, elevating the importance of sustainability in urban planning.

May 8 - The Daily Californian

Aerial view of Chicago with river in foreground.

Chicago Approves Green Affordable Housing Plan

The Mayor’s plan calls for creating a nonprofit housing corporation tasked with building affordable housing that meets Green Building standards.

May 8 - CBS News Chicago

Urban Design for Planners 1: Software Tools

This six-course series explores essential urban design concepts using open source software and equips planners with the tools they need to participate fully in the urban design process.

Planning for Universal Design

Learn the tools for implementing Universal Design in planning regulations.

Comprehensive Bikeway Design Workshop

Transportation Research & Education Center (TREC) at Portland State University

Early Bird Deadline – save on your tuition fee!🚨

Institute for Housing and Urban Development Studies (IHS)