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Page Mill Road Expressway: 280 to El Camino Real

Published on: 12/9/2014 11:21 AM


The Page Mill Road Expressway Study project will identify improvements to relieve congestion and improve pedestrian and bicycle connectivity along the expressway and at intersections between I-280 and El Camino Real.  Concept plans and traffic simulation models have been developed for various alternatives. Feasibility analysis will be conducted to further refine the alternatives.

The County is working in conjunction with Caltrans, VTA, City of Palo Alto and Town of Los Altos Hills on this project.

Stay tuned for updated project information and upcoming public meetings or receive the information by clicking the button below and subscribing to our project update list.


Project Updates


The project team has been working closely with City of Los Altos Hills, City of Palo Alto, Caltrans, and VTA staff for input on the technical analysis, including concepts to illustrate potential project configurations. The concepts are planning level drawings (not design level) to determine technical feasibility, potential right-of-way impacts, a cost estimate for the Plan list, and community acceptability. There are three alternative concepts each for the Page Mill/I-280 interchange improvements and for grade separating the Page Mill/Foothill-Junipero Serra intersection.  A final proposed concept for each of these two locations will be one of the alternatives shown or a hybrid/modified concept based on the analysis of the alternatives and community input. 

Page Mill/I-280 Interchange Alternatives

Concept 1-Signaliztion

Concept 1-Signalization Bike and Ped Facilities

Concept 2-Southbound Ramp Realignment

Concept 2-Southbound Ramp Realignment Bike and Ped Facilities

Concept 3-Roundabout Concept

Concept 3-Roundabout Concept Bike and Ped Facilities


Traffic Simulations Videos: Using a traffic demand model, traffic flow simulations have been developed for the AM and PM peak periods for each of the alternatives using projected 2025 traffic volumes.  Videos of the simulations have been posted on YouTube (click here).

Existing Condition AM

Existing Condition PM

Concept 1 Signalization AM

Concept 1 Signalization PM

Concept 2 Southbound Ramp Realignment AM

Concept 2 Southbound Ramp Realignment PM

Concept 3 Roundabout AM

Concept 3 Roundabout PM


Page Mill Road Expressway

Page Mill Expressway between Foothill Expressway and El Camino Real Intersection Improvements

Page Mill Overcrossing Foothill Expressway Alternative 1

Page Mill Under Elevated Foothill Expressway Alternative 2

Page Mill Under Foothill Expressway Alternative 3

Page Mill Between 1-280 and Foothill Expressway Widening to 6 Lanes with Trail

Page Mill at El Camino Expressway


Community Outreach  

As part of the Expressway Plan 2040 Project, Community Meetings were held this fall by Expressway. 

Click here for meeting details; flyers, presentation and summaries.

To see the entire list of meetings return to the Expressway Plan 2040 Project website.


 Project Fact Sheets, Documents and History 

The PageMill280 FACT SHEETS and System Maps are available on a separate page.

The project documents and history are available on a separate page.


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