Opening of Proposals - Traffic Signal central management Proj No 125-051 - Lochmueller Group

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"• 23MPERIENC 6-1 '4,6 Lochmueller played a key role in St. Charles County's county -wide Traffic Management System expansion, providing system planning, arterial corridor ITS design, and traffic signal optimization across multiple phases. The multi -phased program upgraded the County's communications network to support TransSuite ATMS software and developed coordinated signal timing plans for 17 signal groups. Lochmueller led implementation for eight of these groups, many at critical freeway interchanges and adjacent intersections. This required complex cross - corridor coordination and diversion timing strategies for incident management. Phase VI focused on signal optimization for three major corridors: Mid Rivers Mall Drive (11 signals), Salt Lick Road (5 signals), and Spencer Road (10 signals). They served traffic volumes of 11,000 to 35,000 vehicles per day. These corridors are lined with residential and commercial developments, making peak -period efficiency a priority. Lochmueller conducted extensive traffic volume counts, identified locations prone to excessive delays, and measured travel times using GPS devices and PC -Travel software. The goal was to achieve efficient progression of through -traffic while minimizing intersection delays. Signal timing plans were developed for morning, midday, evening, and weekend periods, with special church, school, and off- peak timing implemented where warranted. Cycle lengths, splits, and offsets were carefully balanced to maximize corridor progression without compromising side -street operations. Coordination extended to MoDOT signals at key interchanges to ensure seamless progression across jurisdictions. Phase VI delivered measurable improvements in travel time, consistency, and overall traffic flow. This phase also included network architecture design, development of ATMS software procurement documents, and ITS component design. EVANSVILLE CITYWIDE EMERGENCY PREEMPTION CITY OF EVANSVILLE, IN Lochmueller provided traffic engineering services for the City on a citywide Emergency Vehicle Preemption (EVP) project improving emergency response. The system covers 188 municipal and 49 INDOT signals, providing seamless preemption across most signalized corridors in Vanderburgh County, where no operational EVP existed before. Our team supported all phases, from system selection to final design and bidding. To meet funding deadlines and avoid developing plans for 237 intersections from scratch, we utilized as -built drawings and field investigation images to expedite plan production. Upon implementation, the EVP time savings was approximately 10 seconds per signalized intersection, which is critically important in scenarios where seconds and minutes matter. LOCHMUELLER GROUP 1 10