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Committee backs staff concept for SR‑237/Middlefield safety redesign, cites crash history and multimodal upgrades
Summary
The committee voted to recommend staff’s Alternative 3 for the SR‑237/Middlefield interchange: traffic calming on frontage roads, Class 4 bikeways, widened sidewalks, protected intersection improvements and signal optimization; staff estimates cost at $24.8 million and plans environmental work through 2026 and final design in 2027–28.
The Council Transportation Committee voted on June 16 to recommend staff’s design concept (Alternative 3) for the SR‑237/Middlefield interchange improvements and to forward that recommendation to City Council for approval of the design concept and continued environmental work.
Staff described a corridor with a concentrated collision history near the 237 on‑ and off‑ramps and constrained space for pedestrians and cyclists because of the Caltrain corridor and adjacent frontage roads. The project team evaluated six alternatives and refined Alternatives 3 and 4 after Caltrans expressed concerns about options that would create new mainline access to SR‑237. Staff recommended Alternative 3 as the option that meets safety and multimodal goals within available funding.
Key elements of the recommended concept include traffic‑calming measures on the westbound frontage road (median islands, pavement markings, radar speed feedback signs and lane‑narrowing design), the construction of Class 4 protected bikeways and six‑foot sidewalks on Middlefield Road, protected intersection treatments at ramp junctions, and signal timing and coordination with separate bicycle and pedestrian phases. Staff said the project estimate for the recommended alternative is $24.8 million; project approval and environmental review are expected by the end of 2026, final design 2027–28 and construction over approximately two years thereafter.
Committee members asked for concrete crash counts and evidence supporting the safety case; staff cited rising collision totals in the corridor over successive five‑year windows (26 → 31 → 44) and said roughly 75% of collisions in the project study area clustered at the Middlefield/237 ramp intersections. Public commenters recommended additional, lower‑cost calming such as rumble strips and urged the most protective feasible bikeway sections at interchange locations. April Webster (regional technical committees) and other commenters asked staff to evaluate raised or sidewalk‑level bikeways where feasible and to coordinate with Caltrans District guidance and VTA interchange research.
After discussion, committee member Mallister moved and a second was recorded; the motion recommending staff’s design concept advanced on a roll‑call vote carried 3–0 (Member May: yes; Member Mallister: yes; Chair Hicks: yes). The recommendation will be forwarded to council for design authorization and continued environmental review.
Staff emphasized that coordination with Caltrans and neighboring jurisdictions will continue during design, and that the project includes opportunities to incorporate landscaping and green stormwater infrastructure consistent with the city’s biodiversity and urban forest plan.
