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14 Slocum TIA April 22, 2025 Intersection Crashes A majority of crashes within the study area are rear-end collisions. This type of collision is typical at congested signalized intersections. Additionally, there were a significant number of turning crashes at Coburg at Chad and Coburg at the Beltline WB ramps. Most of these crashes were left-turning vehicles colliding with the oncoming through vehicles. This is a typical occurrence for highly congested roadways with protected-permissive phasing. There are no improvements proposed for these intersections. BACKGROUND TRAFFIC VOLUMES 6.1 INTERSECTION COUNTS As part of the analysis, AM and PM turning movement counts were collected in October 2024 at the study area intersections. Traffic counts are collected for the weekday time periods of 7:00 AM to 9:00 AM and 4:00 PM to 6:00 PM. The peak hours of the system are 7:45 to 8:45 for the AM and 4:30 to 5:30 for the PM. The traffic counts are included in Appendix D. 6.2 SEASONAL ADJUSTMENT The application of seasonal adjustment factors accounts for the fact that through volumes along State Highways and recreational routes tend to fluctuate from month to month due to changes in recreational behavior, etc. Monthly volume variations for routes with recreational traffic show much higher seasonal peaking than routes with predominantly intercity traffic. All studied intersections are intercity and typically do not experience a seasonal fluctuation. Consistent with the City of Eugene standards and criteria, a seasonal adjustment factor was not applied. Additionally, the counts were taken while the existing school was in service and taken on a typical school day. Therefore, no adjustment to the base volumes is necessary. 6.3 FUTURE YEAR BACKGROUND VOLUMES The development is proposed to be completed by the year 2027. Consistent with the traffic impact analysis criteria, the intersections were evaluated for the year 2027 and a 5-year planning horizon, year 2032. To estimate the year 2027 and year 2032 traffic volumes, a 2 percent per year growth rate (consistent with the City of Eugene growth rate methodology) is applied to the existing traffic counts. 6.4 FINAL VOLUMES The existing traffic volumes were adjusted according to the methodology described above. Appendix D provides traffic volume calculations. • Figure 5: Year 2025 AM Background Traffic Volumes • Figure 6: Year 2025 PM Background Traffic Volumes • Figure 7: Year 2027 AM Background Traffic Volumes • Figure 8: Year 2027 PM Blackground Traffic Volumes