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City engineer outlines alley traffic‑calming pilot after speed studies in two neighborhoods
Summary
Lewisville staff proposed a cautious pilot for vertical‑deflection devices in long, straight alleyways after speed studies showed 85th‑percentile speeds near 20 mph where the prima facie alley speed is 15 mph; staff emphasized high thresholds, resident petitions and coordination with emergency services.
City Engineer Brett Bourgeois told the Lewisville City Council on March 2 that staff is proposing a pilot program to test vertical‑deflection traffic‑calming devices in long, straight alleyways after multi‑day studies found speeds higher than expected.
Bourgeois said studies on two alleyways—Piedmont and Lake Crest—showed 85th‑percentile speeds around 20 miles per hour compared with the prima facie alley speed of 15 mph under state law, and recorded roughly 90 vehicles over multiple days on Piedmont (average daily trips 20–25) and about 440 vehicles on Lake Crest (average daily ~140). "We saw that the 85th percentile ... was 20 miles per hour, which is considerably higher than the 15 miles per hour," Bourgeois…
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