Sedgwick County engineers stress data-driven approach to speeds and intersection controls

Lynn Packer, director of public works and county engineer, told county commissioners the statutory default speed and driver expectations explain why roughly 82% of county-maintained miles have speed limits of 50–55 mph and, combined with township roads, about 92% of the local road network is at 55 mph.

"It comes down to KSA 8 15 58," Packer said, explaining that the statute sets the default speed for county and township highways at 55 miles an hour, and that the county can only adjust limits after local speed and safety studies. Packer summarized the county’s paved-intersection inventory — 91 paved intersections — and the distribution of control types: about 46% two-way stop controlled, 14% all-way stop, and 19% signalized on that paved set.

Packer and traffic engineer Tia Romant emphasized that the county follows MUTCD guidance and the 3-year crash-history approach from the manual when deciding on control changes, including that intersections with six or more "correctable crashes" in three years warrant stronger controls. Commissioners pressed staff on whether the county should act preemptively rather than waiting for crash thresholds; staff said strategic, evidence-based intervention is preferred but noted cost and driver-expectation trade-offs.

Why it matters: staff said a consistent, defensible process reduces the chance of creating new safety hazards from overcontrolling low-volume rural intersections. The county will use incoming Socrata crash feeds and the next countywide traffic-count year (2026) to re-evaluate intersections and recommend targeted investments.