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Signage at I-80 ICM Groundbreaking Event on October 19, 2012

I-80 SMART Corridor Project

Interstate 80 SMART Corridor Project

As many as 270,000 vehicles per day use the I-80 corridor, one of the busiest in the Bay Area. The I-80 SMART Corridor Project (I-80 Integrated Corridor Mobility), representing one of the most comprehensive Intelligent Transportation Systems in the state, is implementing a network of integrated electronic signs, ramp meters and other state-of-the-art elements between the Carquinez Bridge and the Bay Bridge to enhance motorist safety, improve travel time reliability and reduce accidents and associated congestion.

Real-time traffic information, such as variable speed signs and blocked lane signs, will allow drivers to make informed decisions in the event of an incident. Once activated in spring 2016, these ramp meters and real-time message signs along the corridor will contribute to optimized roadway operations and improved safety, and will be integrated with, and managed from, the Traffic Management Center at the Caltrans Bay Area headquarters in Oakland. Additional improvements include adaptive ramp metering on 44 on-ramps to reduce merging conflicts and manage traffic volumes on I-80.

Have you seen the big electronic signs on westbound Interstate 80 (Eastshore Freeway) between Richmond and the Bay Bridge? These are part of the project, which broke ground in fall 2012 and is anticipated to be completed by early 2016. For up-to-date project information, including nightime closures and sign testing visit

Go to to learn more about the new signs for freeway drivers that will provide real-time recommended speed limit, traffic accident and other information, as well as information about new smart ramp-meters along the corridor.

See an infographic that explains the overhead signs.

Read the Project Fact Sheet here.
Descripción del Proyecto

Learn more about the project components in the video below:


The $79 million I-80 ICM Project is funded largely by the Corridor Mobility Improvement Account and the Traffic Light Synchronization Program—both created by State Proposition 1B. Approximately $2.8 million of the total project is funded by the Alameda County Measure B half-cent sales tax and $5 million by Contra Costa County Measure J half-cent sales tax. 
Read the Project Fact Sheet here.


Adaptive Ramp Metering

Every on-ramp along the corridor will be metered (a total of 44 ramps), using adaptive ramp metering, which is a “smarter” approach to ramp metering. It uses an algorithm that considers freeway and ramp volumes and then adjust the rates accordingly for optimal flow along the entire corridor. Queue spill-back detectors at on-ramps will prevent possible spill back onto local streets so as not to impact arterial operations, and faster metering rates will be utilized to ensure ramp queues are cleared if they extend beyond the queue spill-back detectors. Adaptive ramp metering optimizes the flow of traffic, reduces accidents by reducing merging conflicts, reduces overal corriddor delay, and facilitates safe and convenient merging as vehicles enter the freeway.

Incident Management
As part of incident management, real-time information will be provided to motorists using electronic changeable message signs, variable advisory speed signs, and informational message signs. Real-time traffic information will allow drivers to make better choices during their trip regarding route and mode to reach their destination, which result in more reliable expectations regarding travel times.   

Draft Initial Study Environmental Assessment - 2011

The Draft Initial Study Environmental Assessment (Draft IS/EA) for the Interstate 80 Integrated Corridor Mobility (ICM) project was available for a 30-day public review and comment period in 2011. Electronic files of this draft environmental document are available online at Please note, the public comment period has ended.

Open houses were held in May 2011 at the Albany Senior Center and at San Pablo City Hall. For more information about the project and the public meetings, see the documents below or visit

Groundbreaking - October 19, 2012

Caltrans and Alameda CTC, in collaboration with the Contra Costa Transportation Authority and the West Contra Costa Transportation Advisory Committee, held a groundbreaking ceremony for the Interstate 80 ICM Project on October 19, 2012 at Shorebird Park in Emeryville. See the photos of the event below.

“Safer and more efficient and reliable traffic flows along I-80 are essential to the current and future vitality of the Bay Area,” said Alameda CTC Chair Mark Green, at the project groundbreaking. “Alameda CTC is working to ensure that county and regional transportation systems will run as smoothly as possible and keep up with demand as the Bay Area’s population grows—using high-tech solutions to increase capacity on our existing roadways. This project means time savings and greater convenience for Bay Area residents and businesses that rely on the I-80 corridor.”

All photos by John Huseby/Caltrans