County staff describe speed‑hump design, spacing and markings
Summary
Project staff said the pilot will use a parabolic speed‑hump profile about 3 inches high, with thermoplastic markings and warning signs; humps are proposed at roughly 300–500 foot spacing to manage speed while maintaining smooth traffic flow.
Betty Tes Fu and Glenn Henninger described the technical aspects of the proposed speed humps and how they are expected to affect motorist behavior.
Betty said the design follows established standards and is "about roughly, 3 inches at its center," adding that white thermoplastic pavement markings and warning signs will be installed to make the humps visible. She described spacing of approximately 300 to 500 feet between humps to balance speed reduction and traffic flow. Glenn and John noted photos from the City of St. Louis show humps that extend nearly to the gutter line and include pavement striping and advance signage to warn drivers.
Staff emphasized the program’s choice of speed humps—rather than stop signs—as the physical treatment meant to force behavioral change; they said stop signs are not an effective traffic‑calming substitute and cannot be removed without County Council action.
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