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New Lake Elmo Elementary School & Oak-Land Middle School August 1, 2024 Transportation Study Page 25 Trip Proportional Share Based on the year 2026 build conditions analysis, intersection improvements were identified at the 10th Street/Lake Elmo Avenue intersection. The improvements are triggered based on a combination of background traffic and the maximum enrollment of the elementary school. It should be noted that operational issues were identified at the intersection during the p.m. peak hour under existing conditions. Therefore, to identify the number of trips the proposed elementary school contributes to the intersection, a trip proportional share analysis was conducted. The intersection is currently an all-way stop control, therefore, all movements conflict with each other and contribute to the overall operations of the intersection. The trip proportional share, which is shown in Table 9, was developed by taking the expected elementary site trips entering the intersection and dividing them by the total number of entering vehicles under the year 2026 build conditions. The review included daily trips as well as each of the three peak hours analyzed (i.e. a.m., school departure, and p.m. peak hour) given issues were identified under all peak hour scenarios. Note that the proportional share was primarily focused on the Lake Elmo Elementary School trips, as the school times are largely staggered from each other and the increase in trips from Oak-Land Middle School during the p.m. peak hour is expected to be minimal. The resultant proportional share of trips that the proposed elementary school contributes to the intersection ranges from seven (7) to 35 percent. Table 9. 10th Street/Lake Elmo Avenue - Trip Proportional Share (2026 Build) Entering Volumes A.M. Peak Hour School Departure Peak Hour P.M. Peak Hour Daily Lake Elmo Elementary Site Trips 580 350 125 1,750 Year 2026 Build Total Volumes 1,645 1,490 1,710 18,120 Proportional Share 35% 23% 7% 10% In addition to assessing the 10th Street/Lake Elmo Avenue intersection, daily volumes were also reviewed along the study roadways. A summary of the current background traffic and the traffic volume changes associated with the school developments is shown in Figure 11. Note the background traffic volumes are based on the 24-hour volumes collected as part of the study and adjusted using the general background growth rate. The ADT comparison indicates that most study roadways are only anticipated to increase by approximately one (1) to 10 percent as a result of the school developments.