San Mateo transportation planners say the State Route 92/Highway 101 direct-connector project now comes with a local bonus round: specific upgrades to the Hillsdale Boulevard interchange meant to calm chaotic merges and cut crash risks. The ideas under review would rework northbound ramps, add turn lanes on Hillsdale and stretch out merge areas on northbound 101. Project partners are pitching the package as a targeted tune-up for a notorious chokepoint that regularly clogs traffic and pushes impatient drivers onto neighborhood side streets.
The changes were detailed by the San Mateo Daily Journal, which reported on loop-style ramp and intersection tweaks at Hillsdale. Current concept designs would avoid taking homes or parkland, although some alternatives could nibble into utility easements or small front yards along Norton Street. Agency staff told the paper the goal is to cut collision rates and discourage drivers from ducking onto residential streets. Neighborhood residents and transit advocates, meanwhile, are flagging the familiar concern that adding lanes can simply invite more driving.
Design options on the table
Project sponsors are weighing three build alternatives plus a no-build option: a westbound SR-92 connector feeding into both directions of the US-101 express lanes, a reversible express-lane connector that would switch direction with the peak commute, and a connector from the express lanes into eastbound SR-92. Those choices, along with their managed-lane, demand-pricing setup similar to the existing express lanes, are laid out by the San Mateo County Transportation Authority. SMCTA says it will pick a preferred alternative after technical studies and another round of public feedback.
Safety, ramps and neighborhood impacts
Caltrans project materials show the Hillsdale on-ramp would be replaced with a loop-style ramp designed to create a longer merging stretch on northbound US-101. The Hillsdale intersection would also gain an eastbound right-turn lane and a dedicated westbound left-turn lane, changes that are meant to slow turning traffic and make bike and pedestrian crossings less nerve-wracking, according to Caltrans District 4. The agency notes that most construction is expected to stay within the state right-of-way.
Local coverage has pointed out that collision counts on the northbound Hillsdale ramp are higher than typical for similar ramps, a key talking point staff have used in arguing for the redesign, as reported by the San Mateo Daily Journal. That safety argument is helping carry the proposal even as questions linger about traffic, noise and spillover impacts on nearby streets.
Timeline and approvals
The direct-connector remains tied up in the environmental review process, and regional planning documents sketch out a multi-year slog of studies, approvals and, eventually, construction. The Metropolitan Transportation Commission agenda packet lists a target date for federal action in late 2028, along with program tables that map out preliminary engineering, right-of-way work and construction phases. All of that underscores a key caveat: a preferred alternative and full funding still have to be nailed down before anyone starts drawing up detailed blueprints.
How to weigh in
SMCTA and Caltrans say they want public feedback to help shape the final design and any mitigation measures. Residents can sign up for the 101/92 project newsletter and send questions using the contact information on the SMCTA, which also includes past scoping meetings and technical reports. The agencies say outreach will continue as the draft environmental document is developed.
Legal implications
Caltrans' Notice of Preparation for the environmental review states that most of the proposed work would occur within existing state right-of-way and that any private-property impacts are expected to be limited to narrow "sliver acquisitions" that should not affect buildings or access, according to the agency's filing on the CEQAnet portal. That carefully chosen language is aimed at reducing the likelihood of outright eminent-domain takings, after earlier, larger-scale rebuild ideas drew strong backlash over potential property losses. The tension between avoiding property takings and delivering a regional traffic fix is expected to shape both the technical decisions and the local political debate as the project moves toward a draft environmental document.
