I-10 Express Lanes Project Continues to Progress with Recent Traffic Switch

March 17, 2022

Traffic switches are when one or more lanes of traffic are moved into a different configuration to create space for construction activities. They are a vital element in the progression and safety of a construction project and they create a safe work location for crews to remove and rebuild portions of existing overpasses.

There are more than twenty different construction operations taking place on any given day or night as part of the I-10 Express Lanes Project with dozens of crews and large equipment along the roadway. For SBCTA, safety is of the utmost importance while crews work throughout the ten-mile corridor on demolition and reconstruction of bridges, retaining walls, sound walls, utility relocation, and pavement rehabilitation.

There are several areas along the I-10 Express Lanes Project where traffic lanes switch toward or away from the median and shoulder. While drivers may not notice when lanes have shifted less than two feet from their original alignment, other areas are more significant and require extra caution and motorists are encouraged to stay alert to the changes in traffic patterns.

Another configuration used to create space is referred to as a crossover lane where lanes of traffic are split and separated from other lanes. Crossover lanes are being built to allow traffic to safely cross onto the opposing side of the freeway. Local streets may also have traffic switches, an example of this is Euclid Avenue. Northbound lanes are shifted to where the median used to be while crews build a new portion of the Euclid Bridge over the I-10.

Most recently, the two left lanes of westbound (WB) I-10 approaching 4th Street in Ontario shifted toward the median and are now separated with barriers from the remaining lanes. The three remaining lanes of WB I-10 stayed in their current configuration. Please note, motorists in all lanes will have access to the WB I-10 Euclid Avenue off-ramp.

Within the next few weeks, the current eastbound I-10 left crossover lanes at Monte Vista in Montclair will be adjusted to have both lanes begin before the Monte Vista Avenue off-ramp. And in April, the northbound Euclid Avenue lanes will shift to the newly built portion of the bridge and the southbound lanes will shift to where the median was – signifying a major progress milestone for the Euclid Avenue bridge.

Motorists should obey all traffic control through the I-10 Express Lanes work zone, reduce speeds, and stay alert to moving equipment and workers near travel lanes. For more information, visit

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