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Traffic Mitigation & Concurrency
Traffic Mitigation & Concurrency (UDC Chapter 30.66B SCC)
Overview and Background
Chapter 30.66B SCC
(select The Unified Development Code and then Chapter 30.66B)
Currently Adopted Public Works Rules for Chapter 30.66B SCC
Ultimate Capacity
Impact Mitigation Fee Credit
Reciprocal Traffic Mitigation Agreements, Forms & Information
Traffic Study Tools & Information for Developers & Traffic Consultants
Turn Lane Channelization Analysis Guidelines (November 2014)
Left Turn Lane Channelization Analysis shall be completed using the
Guidelines for Left–Turn Lanes from the ITE 1990 Compendium of Technical Papers (PDF)
. (November 2014)
Right Turn Lane Channelization Analysis shall be completed using the
Right-Turn Lane Guidelines found in section 1310.04(3) and Exhibit 1310-11 of the WSDOT Design Manual
. (November 2014)
Arterial Unit Categories (PDF)
(October 2015)
Inadequate Road Condition Designations (PDF)
(September 2021)
Key Intersections List (PDF)
(June 2022)
Map - Key Intersections (PDF)
(June 2022)
Map - Arterial Units (PDF)
(December 2021)
Map - Arterial Units Status (PDF)
(December 2021)
Required Format for Trip Distributions (PDF)
(May 2017)
State Highways of Statewide Significance as Designated by WSDOT (PDF)
Synchro Calibration Revision (PDF)
Requirements for Traffic Studies with Future Level-of-Service Analysis (PDF)
(January 2017)
Annual Concurrency Reports
Overview of the Concurrency Management System (PDF)
2017 Report (PDF)
(April 1, 2016 through March 31, 2017)
2017 Report (PDF)
(January 1, 2017 through December 31, 2017)
2018 Report (PDF)
2019 Report (PDF
)
2020 Report (PDF)
2021 Report (PDF)
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Chapter 30.66B Update
Impact Mitigation Fee Credit
Overview & Background
Public Works (DPW) Rules
Reciprocal Agreements
Ultimate Capacity
History of Ultimate Capacity
Designated Roads
Objectives of Ultimate Capacity
How Ultimate Capacity Works
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