The express lanes on Highway 101 have seen modest increases in use from the prior year, generating 20% more revenue and slightly more trips costing $12 or more.
The current express lanes, which opened over two years ago, stretches 22 miles on Highway 101 from the Santa Clara County line to Interstate 380. During fiscal year 2025 — which ended in June — there were 15 million express lane trips, with 59,341 average daily trips, a 6% increase from the previous fiscal year.
The trips generated about $35 million in revenue last fiscal year, a 22% increase from the year prior.
The express lane data also showed that drivers in both northbound and southbound lanes are reaping the benefits, with speeds between 11 to 12 mph greater than non-express lanes, though a higher share of trips are more expensive, Vong said.
“There's still capacity, but we now see a change where the majority of trips are still under $3, but that is a difference that is down by about 8.2% from what we see the previous years,” Vong said. “We are seeing more trips that are above the $12 mark, but that's still a fairly low percentage of the total trips we’re seeing.”
The data is especially critical as the San Mateo County Transportation Authority has started conducting research on expanding the project north of Interstate 380, either by converting an existing lane into an express lane or constructing a brand-new one. But the project has been controversial almost since the beginning. Transit advocates and some elected officials have expressed concern that the TA will not have the data to determine whether the current express lanes have improved congestion — one of the primary goals the agency touted for the project. In fact, some have suggested congestion has only increased, particularly for those in the nonexpress lanes.
Jackie Speier, TA board member and San Mateo County supervisor, said in a board meeting several months ago that she was concerned about the county spending millions of dollars on the early stages of the project.
The initiative is in the environmental and preliminary design phase, a multiyear effort that is expected to be completed by the middle or end of 2026.
(2) comments
In implementing this project, the County made two decisions: 1) to install Express Lanes; and 2) to widen the highway. This article and previous reports from the County only address the first decision. When will we see data on whether the widening of the highway, at additional cost to taxpayers, was a solid investment? What has been the impact on air pollution for the residents living adjacent to the highway? What has been the impact on congestion and danger on roads adjacent to the highway?
Is the Express Lane benefit (higher speeds) due to speeds in the non-Express Lanes decreasing? If so, this would run counter to the intent of the project.
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