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Winter Park staff lays out data-driven speed study method and thresholds for traffic calming
Summary
Staff described how the city will collect speed and volume data to compute 85th-percentile speeds and use thresholds (7 mph over limit on local streets; 10 mph on collector roads) to determine whether calming treatments are warranted.
At the task force meeting, staff described a standard field-data process: install traffic counters, collect speed and volume data, compute the 85th percentile speed and compare findings against set thresholds to determine whether a roadway is warranted for traffic calming.
"We will then determine what the 85th percentile speed is," the presenter said, and added the thresholds used by Winter Park: 7 miles per hour over the speed limit on local streets and 10 miles per hour over the speed limit on collector streets. Staff said the city references a National Association of City Transportation Officials publication for guidance and noted that the method provides guidance rather than a legally defensible standard. Staff also described before-and-after studies (about six months to a year) to confirm whether interventions achieved intended outcomes.
