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Lone Tree Way / A Street

Cavallo Road Bridge Demo - Photo Courtesy of Karl NielsenThe Lone Tree Way/A Street segment is the fourth segment along the corridor, between Contra Loma Boulevard/L Street and Hillcrest Avenue. The project will expand the highway from four to eight lanes, including three mixed flow lanes and one High Occupancy Vehicle (HOV) lane, from just west of Lone Tree Way/A Street to just west of Hillcrest Avenue. The project includes reconstruction of the Lone Tree Way/A Street Interchange and widening the highway median to accommodate mass transit (BART).

Lone Tree Way / A Street Map


Bay Cities/Myers, Joint Venture


$59.8 million


Construction began in August 2012 and the majority of the segment is expected to be open to traffic in the summer of 2016.


Milestone Activities:

  • Opening the Highway 4 westbound freeway to full capacity adding an HOV lane and an auxiliary lane between the Hillcrest Avenue and A Street / Lone Tree Way interchanges-May 4, 2016.
  • Opening the Highway 4 eastbound freeway to full capacity(with the exception auxiliary lane)  between Cavallo Road and the Highway 4 / SR160 connector ramp May 2, 2016.
  • There will be a permanent left hand turn closure from westbound Bryan Ave. to southbound A Street starting on April 14, 2016.
  • Opening the Highway 4 eastbound freeway to full capacity between L Street / Contra Loma Boulevard and Cavallo Road adding an HOV lane, a multi-use lane, opening the eastbound on ramp at L Street / Contra Loma Boulevard and an auxiliary lane between the L Street / Contra Loma Boulevard and A Street  / Lone Tree Way interchanges-June 2016.
  • Opening the Sunset Drive Extension between A Street and Bryan Avenue adding a new signalized intersection at A Street and Rossi Avenue / Sunset Drive-June 2016.

Recently Completed Work:

  • Switched the Highway 4 eastbound on and off ramp traffic to the south to allow the north half of the ramps to be constructed.
  • Completed the eBART median improvements for this segment.
  • Opened an additional  Highway 4 westbound lane between Hillcrest Avenue and A Street/ Lone Tree Way.
  • Opened an additional Highway 4 eastbound exit lane between Contra Loma Boulevard and A Street / Lone Tree Way.

Upcoming Work:

Cavallo Road Bridge Demo - Photo Courtesy of Karl Nielsen

  • Construct a new median on A Street  between Highway 4 and Sunset Drive.
  • Complete the construction of the eastbound Highway 4 on ramp at Lone Tree Way / A Street.
  • Complete the construction of the eastbound Highway 4 off ramp at Lone Tree Way / A Street.
  • Continue the construction of the Sunset  Drive Extension.
  • Continue construction of the remaining Lone Tree Way / A Street widening work under the newly constructed Lone Tree Way / A Street bridge.
  • Complete construction of the sound wall along the Highway 4 eastbound mainline between A Street / Lone Tree Way and Hillcrest Avenue.