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Traffic study says Moraga Avenue can absorb modest trip increase; staff proposes Red Rock signal and stopping‑sight standards
Summary
Traffic consultants told council counts from Sept. 2023 show about 11,000 vehicles per weekday on Moraga Avenue and projected development trips would add roughly 910 daily trips (about 5%). Staff recommended a signal at Moraga/Red Rock and driveway placement guided by Caltrans stopping-sight-distance.
Traffic consultant Sam Tabibnia (Farron Piers) reported that counts collected in September 2023 show roughly 11,000 vehicles per weekday on Moraga Avenue, with median speeds of about 35 mph and 85th‑percentile speeds of 38–39 mph (both above the posted 25 mph limit). The study found truck traffic of about 2% and low pedestrian crossing counts near Coaches Field.
Using trip generation rates (ITE manual), staff estimated the plan's full build-out would add about 910 daily vehicle trips (roughly a 5% increase on Moraga Avenue), and about 74–79 peak‑hour trips. Staff recommended accommodating driveway placement with stopping‑sight‑distance analysis at the project design stage, installing a flashing beacon and a signal at Red Rock Road to improve turning and pedestrian crossings, and building a mix of bike-lane improvements (Class II and Class III segments) as the plan's design is refined.
Council members asked staff to coordinate with Oakland on downstream impacts; staff said city staff had briefed Oakland but had not received technical comments from Oakland traffic engineers. Staff emphasized that project‑level traffic and sight‑distance studies will be required once a developer submits site plans.
