I-680 Sunol Express Lanes Project

The Alameda County Transportation Commission (Alameda CTC), in cooperation with the California Department of Transportation (Caltrans) and the Federal Highway Administration (FHWA), environmentally cleared the construction of a high occupancy vehicle (HOV)/ express lane on northbound Interstate 680 (I-680) from the State Route 237 (SR-237) interchange in Santa Clara County to north of the State Route 84 (SR-84) interchange in Alameda County. The project was split into two phases to expedite the delivery. Phase 1 broke ground in April 2018. Phase 1 (From State Route 262 (SR-262) to SR-84.)

  • Widen the freeway to accommodate the HOV/express lane together with several auxiliary lanes to facilitate the smooth and safe transition of traffic between local streets and the freeway between interchanges.
  • Add a new 9-mile HOV/express lane and associated improvements between Auto Mall Parkway and SR-84, providing congestion relief in the corridor.
  • Upgrade the I-680 Southbound Express Lane access configuration from controlled access to a near continuous access configuration.
  • Modify bridge crossings.
  • Construct retaining walls to accommodate the widening.
  • Repave the full project limits.
  • Phase 2 (Will widen from SR-262 to the County line.)
  • Construct HOV/high occupancy toll lanes in the northbound direction on I-680 from the county line south of SR-262.
  • Construct nearly five miles of HOV/express lane along the I-680 corridor through widening, along with other necessary improvements, including structure widening/modification and retaining walls.

For total project cost and phase information, see project Fact Sheets tab.

Please direct all media inquiries to:
Tess Lengyel, Deputy Executive Director of Planning and Policy

Please direct all media inquiries to:
Tess Lengyel, Deputy Executive Director of Planning and Policy

For recent press releases, visit our Press Room.


Environmental Process

Pursuant to the California Environmental Quality Act (CEQA) and National Environmental Policy Act (NEPA), Caltrans, in cooperation with the Alameda CTC, studied the environmental effects of this project. These studies show that the project would not significantly affect of the quality of the environment. The report that discusses these findings is called an Initial Study with Proposed Negative Declaration/ Environmental Assessment (IS/EA). Caltrans approved the Initial Study/Environmental Assessment in March 2014. The IS/EA is available for review online at www.dot.ca.gov/dist4/envdocs.htm

A Draft Environmental Impact Report/Environmental Assessment (EIR/EA) was prepared for the I-680 Northbound HOV/express lane project for public circulation beginning in November 2014. The final EIR/EA with finding of no significant impact ("FONSI) was approved July 2015.


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