10.1 SR 08-01-2022 - Laserfiche WebLink

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HIGHWAY 10 CORRIDOR STUDY - FINAL REPORT Figure 27. Peak Hour Capacity for a Four -Lane Grade -Separated Highway Am6�� L Q 50., 1,000 1,500 2,000 2.,500 3,0000 3,500 4,000 4,500 5,0M ■Acceptable Approaching Poor Poor ■V/C> l ■Volunne Range Additional Signal Needs A key consideration when evaluating the long-term alternatives is understanding and quantifying the intersection control modifications that each alternative requires. Highway 10 under existing conditions consists of only one signalized intersection at Highway 10 and 171st Avenue. Each alternative evaluated, requires the removal of the signal at this intersection. Alternative 1 would require the addition of two signalized intersections on Highway 10. One of the signalized intersections would be at Twin Lakes Road and the other would be in the south segment of the corridor, at or near Jarvis Street. Alternative 2 would require one to two additional signals along Highway 10. Under this alternative, it was assumed RCIs were at the intersections of Highway 10 and Twin Lakes Road and Highway 10 and Jarvis Street. Using the projected future daily traffic volumes with the Federal Highway Administration: Restricted Crossing U-Turn Intersection Informational Guide, control needs were evaluated for these two RCI locations. The RCI control thresholds along with the future intersection daily volumes are shown in Figure28. Based on this figure, the Twin Lakes Road RCI would need to be signalized, and the Jarvis Street RCI is right at the threshold of needing to be signalized. Year 2045 peak hour capacity analysis was performed at the Highway 10 and Jarvis Street RCI to determine if this location would have acceptable operations as an unsignalized RCI. Year 2045 peak hour analysis showed that location would have poor operations as an unsignalized RCI (shown in AppendixD). Alternative 3 is the grade separated alternative, eliminating all at -grade intersections on Highway 10. Under this alternative there will be no signalized intersections on Highway 10. a �Hway