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Springfield council keeps temporary speed cushions on Centennial after pilot shows lower speeds but local diversion
Summary
A city pilot installing temporary rubber speed cushions on Centennial Boulevard reduced average speeds from about 34 mph to 25 mph, but staff data show traffic rose on nearby local streets — prompting council to keep the pilot in place, seek more outreach and request a briefing memo on arterial classification before further changes.
Springfield — City staff recommended keeping temporary speed cushions installed on Centennial Boulevard after a year-long pilot showed notable speed reductions but also redistributed traffic onto nearby local streets.
Transportation Planning Engineer Michael Liebler told the City Council that ‘‘Before the traffic calming, the average speed was 34 miles per hour with a 80 fifth percentile speed of 37.’’ After the cushions were installed the ‘‘average speed…was found to be 25 miles per hour with an 80 fifth percentile speed of 30 miles per hour,’’ he said.
The pilot — installed in 2024 on Centennial between 21st and 28th streets — used pinned rubber speed cushions and was analyzed with before-and-after counts. Liebler reported weekday volumes on Centennial declined…
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