2023-08-28-minutes-public-works-study-session

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KITTITAS COUNTY DEPARTMENT OF PUBLIC WORKS PUBLIC WORKS — BOARD OF COUNTY COMMISSIONERS STUDY SESSION STAFF REPORT STUDY SESSION DATE: August 28, 2023 TOPIC: Wilson Creek Road Speed Study Results ACTION REQUESTED: Schedule a Public Hearing receiving the Engineer's Report on the Request for Speed Increase LEAD STAFF: Joshua Fredrickson RECOMMENDATION: Schedule a public hearing receiving the County Engineer's report on the request for speed increase on Wilson Creek Road (MP 0.00 to MP 0.50) BRIEFING SUMMARY: • A resident requested a speed increase on Wilson Creek Road (MP 0.00 to MP 0.50) on July 9, 2023 • The speed study was conducted on July 18, 2023 to July 25, 2023 • Speed study data collected at MP 0.39 Average daily traffic (ADT) of 1,348 vehicles, with 363 trucks (27%) • ADT distribution is 53.9% northbound and 46.1 % southbound 85% speed at 45.7 Miles Per Hour (MPH) northbound and 50.3 MPH southbound One crash in the past five years BACKGROLNL D: Responding to a request received on July 9, 2023, to increase the posted speed on Wilson Creek Road between Vantage Highway and Judge Ronald Road, Public Works deployed traffic data collectors July 18, 2023, and collected through July 25, 2023. Traffic and speed data was collected at mile post 0.39. This road segment has 27 percent truck traffic within the average daily traffic distribution of vehicle size. Traffic at this location is split 53.9% northbound and 46.1 % southbound. Overall 85 h percentile speed at this location is 48.0 MPH, with directional speeds of 45.7 MPH northbound and 50.3 MPH southbound. DISCUSSION: 85'' percentile speeds show traffic is operating at a speed greater than the current posted speed limit of 35 MPH. The 8511 percentile speeds suggest this roadway segment is more accommodating to an increased speed than the current posted speed limit. The roadway alignment is tangent through this section. There are 22 approaches along this section of