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KITTITAS COUNTY <br />DEPARTMENT OF PUBLIC WORKS <br />PUBLIC WORKS — BOARD OF COUNTY COMMSSIONERS <br />STUDY SESSION STAFF REPORT <br />STUDY SESSION DATE: September 14, 2020 <br />TOPIC: Results of Lyons Road Speed Study <br />ACTION REQUESTED: Set a Public Hearing <br />LEAD STAFF: <br />Mark R. Cook <br />RECOMMENDATION: <br />Set a public hearing to receive the Engineer's Report responding to a citizen request to <br />study speeds along Lyons Road, milepost 0.00 to milepost 1.49. <br />BRIEFING SUMMARY: <br />• Counters deployed from 07/31/2020 to 08/07/2020 <br />• Two counter locations: Milepost (MP) 0.16 and 1.02 (both ends) <br />• Vertical curve evaluation conducted verifying suitability for 50 Miles Per Hour <br />(MPH) <br />• Four short span bridges in the road segment constrict the traveled way <br />• Current speed is 50 MPH <br />• Combined average daily traffic approximately 200 (5 AM — 9 PM) I/- 13/hour, <br />one every five minutes <br />• 85"' percentile speed westbound is 52 MPH <br />• 85'h percentile speed eastbound is 47.2 MPH <br />BACKGROUND. <br />On July 22, 2020 Public Works (PW) received a request to study Lyons Road speeds <br />between Wilson Creek and Naneum Roads. Twenty-eight area residents signed the <br />request (EXHIBIT 1). Responding to the request, PW set speed counters out for a one- <br />week period (07/31 — 08/07/2020). In addition to collecting speed data, PW dispatched <br />our Engineer in Training to evaluate vertical curves in the road segment for conformance <br />to national sight distance design standards. Existing lane widths are minimally impacted <br />by four short span bridges. Petitioners cite walking and bicycle riding as risky activities <br />owing to the 50 MPH speed. Agricultural use and house proximity to the road are also <br />listed as being reasons for speed concern. <br />DISCUSSION: <br />PW evaluation roadway geometrics (vertical curves) affirms appropriate design <br />conformance to national standards of engineering practice. 85'x' percentile speeds in both <br />directions (east and west) are within acceptable performance limits given the current 50 <br />Page I of 4 <br />PUBLIC WORKS BOARD OF COUNTY COMMISSIONERS WORK SESSION STAFF REPORT <br />