30.66B.035 Traffic study – when required.
(1) A development adding more than 50 peak-hour trips shall be required to provide a traffic study to enable the department of public works to make a concurrency determination in accordance with SCC 30.66B.125, unless the department determines at the pre-submittal conference that a study is not required.
(2) Applicants for mineral operations submitted in accordance with chapter 30.32C SCC shall be required to provide a traffic study to enable the department of public works to analyze and assess appropriate mitigation for impacts to the road system resulting from the activity.
(3) A traffic study may be required of a developer to analyze a potential inadequate road condition pursuant to SCC 30.66B.210.
(4) A developer shall provide a traffic study for developments that add three or more peak-hour trips when the department of public works determines there is a need for additional information on:
(a) Impacts of the development on any arterial units in arrears and/or designated ultimate capacity arterial units;
(b) A development’s traffic distribution;
(c) A possible inadequate road condition;
(d) Adequacy of any road system impact fee required pursuant to this chapter, in representing reasonable and/or adequate mitigation for that particular development; or
(e) A suspected traffic impact that may warrant mitigation beyond that provided through the road system impact fee payment system.
(5) The traffic study will consist of at least a traffic generation and distribution analysis but may be as extensive as analyzing all arterial units on the road system wherever three or more peak-hour trips from the development are added.
(6) A traffic study or other additional information may be required as a result of changes in the development proposal.
(7) The director of public works may waive the requirement for a traffic study and so state the finding in the pre-submittal conference-scoping sheet, if the director finds there is sufficient information known about a development’s road system from previous traffic studies. In such cases, the existing information will be used to establish any necessary traffic mitigation requirements to be recommended in the review of the development.
(8) Developments impacting roads under the jurisdiction of the WSDOT, a city or another county, shall provide a traffic study to address impacts of the development, as may be required in an interlocal agreement pursuant to SCC 30.61.230(6) with the WSDOT, city or other county. (Added by Amended Ord. 02-064, Dec. 9, 2002, Eff date Feb. 1, 2003; Amended by Amended Ord. 05-083, Dec. 21, 2005, Eff date Feb. 1, 2006; Amended by Amended Ord. 10-072, Sept. 8, 2010, Eff date Oct. 3, 2010; Amended by Amended Ord. 21-060, Oct. 6, 2021, Eff date Oct. 22, 2021).