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HomeMy WebLinkAbout2017-05-15-J03 Speed Limit Ordinance_SE Westown Pkwy_INTRO, 1ST READ1, ►4 Waukee 1'I / THE KEY 7O GOOD LIVING AGENDA ITEM: CITY OF WAUKEE, IOWA CITY COUNCIL MEETING COMMUNICATION MEETING DATE: April 17, 2017 AGENDA ITEM: Consideration of approval of an ordinance to amend Chapter 501, Waukee Municipal Code, Regarding the speed limit on SE Westown Parkway within the City Limits of the City of Waukee, Iowa [introduction; first, second, third (final) readings] FORMAT: Ordinance SYNOPSIS INCLUDING PRO & CON: The Speed Justification completed November 10, 2015 recommends the posted speed limit in the existing school zone corridor remain at 25 mph and the minor arterial SE Westown Parkway corridor east of SE Parkview Crossing Drive be posted at 35 mph. FISCAL IMPACT INCLUDING COSTBENEFIT ANALYSIS: COMMISSION/BOARD/COMMITTEE COMMENT: STAFF REVIEW AND COMMENT: RECOMMENDATION: Approve the ordinance. ATTACHMENTS: I. Proposed Ordinance PREPARED BY: Beth Richardson REVIEWED BY: John Gibson PUBLIC NOTICE INFORMATION — NAME OF PUBLICATION: DATE OF PUBLICATION: ORDINANCE NO. 17- AN ORDINANCE TO AMEND CHAPTER 501, WAUKEE MUNICIPAL CODE, REGARDING THE SPEED LIMIT ON SE WESTOWN PARKWAY WITHIN THE CITY LIMITS OF THE CITY OF WAUKEE, IOWA. WHEREAS, the City of Waukee has determined through a traffic study that a new speed limit shall be implemented on certain portions of SE Westown Parkway within the City of Waukee. BE IT THEREFORE ORDAINED by the City Council of the City of Waukee: Section 1: Chapter 501, Waukee Municipal Code, Regulation of Traffic Upon and Use of the StrWaukee, Iowa, is hereby amended by adding Section 501.9(F)(17) as follows: §5019(F)(17) The speed limit on SE Westown Parkway between SE LA Grant Parkway and Grand Prairie Parkway shall be 35 miles per hour. Section 2 Repealer. All ordinances or parts of ordinances in conflict with the provisions of this ordinance are hereby repealed. Section 3. Severability Clause. If any section, provision or part of this ordinance shall be adjudged invalid or unconstitutional, such adjudication shall not affect the validity of the ordinance as a whole or any section, provisions or part thereof not adjudged invalid or unconstitutional. Section 4. Effective Date. This ordinance shall be in effect from and after its final passage, approval and publication as provided by law. Passed by the Council the day of , 2017, and approved this day of , 2017. Attest: Rebecca D. Schuett, City Clerk William F. Peard, Mayor 1 +Foth November 10, 2015 TO: John Gibson, Public Works Director CC: Josh DeBower, PE FR: Molly Long, PE, Steven Younkin RE: Speed Justification SE Westown Parkway Extension Project No.: 14W021.02 8191 Birchwood Ct, Suite L Johnston, Iowa50131 (515)254-1393 • Fax: (515) 254-1642 www.foth.com Memorandum Introduction The purpose of this memo is to justify the posted speed limit along existing and proposed SE Westown Parkway between SE LA Grant Parkway and Grand Prairie Parkway. Several factors will be considered to justify the chosen speed including roadway geometry, horizontal obstructions, land -use and neighboring speed limits. Speed Justification Location The total length of the study area is 0.75 miles along SE Westown Parkway between SE LA Grant Parkway and Grand Prairie Parkway. The roadway classification according to the city of Waukee is minor arterial_ The existing SE Westown Parkway has separate characteristics from the proposed area. Existing Westown has a posted speed limit at 25 mph. The area is in an urban setting with primarily residential land use and property lines offsets from the traveled way of the road at least 30 ft. It is a two-lane undivided road cross-section with no horizontal curvature and little vertical curvature. Driveway density is low with housing access coming solely through local roads. Additionally there is South Middle School at the west end with a drive accessing Westown. The property adjoining proposed SE Westown Parkway is primarily zoned commercial. The proposed area has a fully implemented access management plan for the commercial driveways. Roadway geometry remains flat and straight. Speed Justification Literature NCHRP report 5011 recommends speeds for streets to be between 30 to 45 mph in the minor arterial functional class. Memo RE: SE Westown Speed Justification November 10, 2015 TABLE39 Typical dinfensions for urban (and suburban) classes Clasa�labfln4%: `YPINBY Arle'iilt Cnlitetnra I.Ueal Item Principal Nlnmr (Nnun•Ptua)i Aiinapmed Speed or i5 m70 45 m55 30 to 45 35 m45 s30 Speed limit bnphl Many organizations use the 85t1' percentile speed of traffic as an indication of the appropriate speed limit. The 851h percentile speed is the velocity at which 85% of vehicles are traveling at or under. With the absence of speed data, a regression equation can be used which was developed by Fitzpatrick et. al Z. This regression equation was calibrated specifically for Suburban/Urban Arterials and takes the form of: EV85 = 8.66 + .963 * (Posted Speed Limit) With the 35 mph posted speed limit this predicts that the 85`h percentile speed will be 42 mph. Recommendation The presence of a school zone in the existing area recommends speed zones to not be raised in the vicinity of the school. Streets with residential land use nearby typically have a 25mph posted speed limit regardless, so it is recommended the existing roadway remain at the 25mph posted speed limit. The proposed corridor's classification as a minor arterial lends itself to not have speeds below 30 mph. The lack of road curvature, 30ft minimum distance from lateral obstructions, and commercial zoning also suggests that a posted speed limit below 30mph would not be appropriate. It is important for drivers to not have a large speed change from zone to zone. The existing roadway has a speed limit of 25mph. Due to lack of length for a vehicle speed transition and the previously mentioned factors the recommendation is to set the proposed corridor speed limit at 35 mph. The recommendation given is setting the speed limit at 35mph in the proposed corridor and leave existing corridor speed at 25mph. This solution accommodates the mixture of roadway factors and driver expectancy most effectively. Appendix 1. Fitzpatrick, Kay, Paul Carlson, Marcus Brewer, and Mark Woolridge, Shaw -Pin Miaou. "NCHRP Report 504" Transportation Research Board (2003). Web. 3 Nov. 2015. 2. Fitzpatrick, Kay, Paul Carlson, Marcus Brewer, and Mark Woolridge. 'Design Speed, Operating Speed, and Posted Speed Limit Practices." Transportation Research Board (2003). Web. 3 Nov. 2015.