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Commission reviews Swan speed data, plans pilots and cites SS4A grant progress
Summary
Staff presented speed data showing an 85th percentile near 30 mph and discussion focused on non‑permanent and permanent calming options; commissioners flagged enforcement limits, discussed a citywide speed study in an SS4A supplemental grant, and endorsed pilot striping tests on Grant Road.
Commission staff presented recent speed data for Swan Street and discussed options to address what neighbors described as increasing traffic speeds.
"We have the 85th and the 50th percentile… 85th is 30, 50 is 25," a staff member summarized, indicating a typical tendency for drivers to exceed the posted 25 mph limit. Commissioners said those averages mask occasional high outliers and that enforcement is constrained by staffing shortages.
Staff and the Safe Streets team described several countermeasures under consideration: temporary radar speed signs, edge‑line striping, flex posts and planters to narrow perceived lane widths, temporary and removable speed humps for demonstration projects, and targeted signage or flashers at high‑risk locations. Staff also said the city applied for SS4A implementation and supplemental planning funds that would support signal LED upgrades, rectangular rapid‑flashing beacons (RRFBs), radar signs and a citywide speed study; staff expects environmental clearance for current SS4A grants within about a month and said federal notifications for supplemental grants typically arrive in six months.
Commissioners agreed to test edge‑line striping on a limited segment of Grant Road (Liot to Lenum) as a pilot and to monitor effects before expanding. They also asked staff to coordinate demonstration projects for removable devices and to follow up with enforcement partners about targeted patrols when staffing allows.
The commission emphasized that permanent speed humps have maintenance and emergency‑response trade‑offs and that a mix of short‑term demonstration devices and longer‑term engineering is the preferred approach. Staff will return with pilot results and any recommended next steps.
