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TAM shows AI pilot for Lincoln Avenue: rapid mapping, wayfinding and low-cost treatments
Summary
TAM presented a 16-week AI-enabled pilot of the Lincoln Avenue corridor that produced land-use and parking maps, identified traffic-stress and collision locations, and suggested shifting cyclists to the parallel SMART pathway with more access points and improved wayfinding. TAM said the pilot cost roughly $12,000 and remains a draft for committee review.
San Rafael
The Transportation Authority of Marin (TAM) presented a draft AI-assisted corridor study for Lincoln Avenue on Feb. 11, showing how a fast, low-cost tool could map land uses, parking and collision patterns and suggest low-cost safety and transit reliability treatments.
"This goal was really to understand what the feasibility and practicality of these tools might be," said Mikaela Hyatt, senior transportation planner at TAM, describing a 16-week pilot conducted with a private partner, Waypoint Transit. Hyatt said the tool ingested publicly available data, aerial imagery and plan inventories to produce mapping layers and a set of intersection-by-intersection potential treatments.
Key findings presented to the Bicycle & Pedestrian Advisory Committee included: an on-street parking inventory of about 170 spaces; a generally present sidewalk network with spotty continuity in places; a Level of Traffic Stress around 3 for cyclists on Lincoln Avenue; and three transit routes serving the corridor with up to four buses per hour in each direction. The draft study highlighted locations where signage and wayfinding could better connect cyclists and pedestrians to the parallel SMART pathway and suggested potential safety measures such as rectangular rapid-flashing beacons, curb extensions and leading pedestrian intervals.
Hyatt underscored that the study was a pilot and draft: it is intended to test methods and speed analysis rather than serve as final recommendations. "It does not represent what our recommendations are for this corridor," she said, and TAM asked the committee to identify any errors or omissions before the report is finalized.
Committee members and residents raised questions about data provenance, field validation, and the risk of AI "hallucinations." Hyatt said the vendor combined automated analysis with engineer review and used street-view checks; she indicated that targeted field checks and a validation pass would be needed before relying on the study for funding or construction decisions.
TAM said the pilot cost approximately $12,000 to run, a fraction of the typical consultant-driven corridor study cost, and suggested the tool could be applied to other constrained corridors in Marin if stakeholders find the outputs useful.
The committee did not take formal action on the draft study; members recommended targeted questions for validation and suggested testing the tool's historical replication ability as part of the vetting process.
