2024-05-07 P & Z Packet - Laserfiche WebLink

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LaLonde Development Traffic Study May 1, 2024 Page 10 Potential Mitigation Alternatives To understand how potential infrastructure or traffic control changes would impact overall area options, the following three alternatives for the Main Street (CR 14) and Centerville Road (CR 21) intersection were reviewed. a)Alternative A: Westbound Right-Turn Lane b)Alternative B: Traffic Signal c)Alternative C: Mini-Roundabout To illustrate the operational difference of the potential mitigation alternatives, an additional year 2027 Phase 2 Build condition intersection capacity analysis was completed. Results of the alternative capacity analysis, shown in Table 4, indicates that each alternative would improve operations, but to varying degrees. With Alternative A, the addition of a westbound right-turn lane helps reduce the westbound queuing along Main Street, but queues will continue to extend beyond Progress Road and impact access. With Alternative B, the addition of a traffic signal improves operations and reduces westbound queues during the peak 15-minute period, which helps improve operations at Progress Road by creating additional gaps in the Main Street (CR 14) traffic flow. With Alternative C, the addition of a roundabout provides the best overall operations at the Main Street (CR 14) and Centerville Road (CR 21) intersection and limits queues from extending to Progress Road. Note that under all potential mitigation alternatives, southbound queues will be relatively similar and are not expected to significantly impact the internal school access along Centerville Road. Table 4 Year 2027 Phase 2 Build Condition Alternative Comparison (PM Only) PM Peak Period Level of Service (Delay) Alternative A Alternative B Alternative C Main Street (CR 14) Intersection (Turn Lane) (Signal) (Roundabout) Peak 15 Overall Peak 15 Overall Peak 15 Overall Centerville Road (CR 21) D (29) C (21) B (19) B (18) B (11) A (8) Progress Road / East School Access A / D (30) A / C (22) A / B (13) A / B (11) A / C (24) A / C (16) th Westbound 95 Percentile Queues 330+ 265 285 265 260 190 th Southbound 95 Percentile Queues 105 90 165 145 165 135 In addition to the operations, other factors such as impacts to on-street parking, right-of-way, pedestrian connectivity / crossings, vehicle speeds, gateway / landscaping treatments, and construction costs, amongst others should be considered. Note that a preliminary signal warrant analysis was completed, which indicates that under existing conditions, current volumes are near the threshold for meeting multiple warrants. Therefore, based on this evaluation, it appears that as area traffic volumes continue to increase, regardless of the proposed development (i.e., background growth only), that improvements at the Main Street (CR 14) and Centerville Road (CR 21) will likely be needed within the next 3- to 5-years. The addition of the proposed development, depending on the development phase, has the potential to move the potential need timeline sooner (i.e., particularly Phase 2). Thus, further coordination with area agencies should occur to determine the level of mitigation (if any) and the approximate timeline for implementation.