1. TRAFFIC STUDY: The Consultant will conduct a traffic study involving data collection, traffic counts, current and future land use planning information, and roadway and right-of-way geometry. The traffic study will need to develop and analyze a minimum of two scenarios for design. The base year for the traffic study will be 2025. There are nine signalized intersections that will need to be addressed and evaluated for turning movements. A traffic count analysis will be needed to measure volume, classifications, and speed of existing vehicle traffic. The traffic study will need to include an analysis of the potential for roundabouts at signalized intersections The consultant will review the following documents and travel demand models as part of the traffic study: • City of Tacoma Master Plan (TMP) The City adopted mode split data is available in the TMP that may be used to develop additional alternatives. Please see the “Developed Alternatives and Traffic Analysis” section for details. A copy of TMP is available at the following URL: https://www.cityoftacoma.org/government/city_departments/public_works/eng ineering/transportation_master_plan tmp. The City is in the process of updating the Transportation Master Plan, which is being renamed the Transportation and Mobility Plan, as part of the statemandated update to the Comprehensive Plan. The anticipated adoption date is June 2025. The plan will include updated mode split targets and new multimodal level of service standards. • City of Tacoma Traffic Demand Model (TDM) The City of Tacoma TDM was developed based on PSRC Travel Demand Model and calibrated and enhanced at the city level in 2014. • PSRC 4K Travel Demand Model The PSRC trip-based model is a system of mathematical and statistical processes that estimates daily travel patterns within the Puget Sound region. The consultant will develop a base year traffic simulation model, then calibrate and validate the model in accordance with the WSDOT Traffic Analysis Guidebook. The consultant will identify the appropriate calibration and validation (C&V) targets. The identified C&V targets will be reviewed and agreed with the city staff before it is implemented. The consultant will use the base year model to develop a 2050 “No Action” alternative, as well as two (2) alternative scenarios. The consultant will summarize the analysis in a technical memorandum. An electronic version of the draft technical memorandum will be delivered for city review. The traffic analysis and modeling files pertinent to all scenarios will be delivered to city in electronic format. The consultant will respond to all review comments to resolve the comment or incorporate the comment into the final memorandum.
