R2022-50 Resolution Authorizing an Amendment to the Agreement with AECOM Technical Services, Inc., for Preparation of the Decatur Intermodal Transportation Master Plan City Project 2014-06

Home Browse Search

traffic volumes and identify the preferred concept to move forward.The study area for the modeling effort includes signalized intersections and major cross-streets along 27th and 221d from approximately Locust Street to the I- 72 interchange. The AECOM Team will describe existing conditions and observed issues; perform traffic analyses and technical assessments and develop and assess three concepts to address current issues and future needs. The SOW includes the following: A. DUATS Regional Travel Demand Forecasting Model The AECOM Team will utilize the most current version of the DUATS travel demand forecasting model to develop future year growth factors.The model will be used"as is" meaning that no detailed updates or model calibration will be completed prior to running the scenarios. The AECOM Team will use the most current socioeconomic(SE)data as a starting point, and we will coordinate with the City to determine if any SE data (population or employment)updates are needed. This is task is not intended to be a comprehensive update of the SE data(i.e., SE data will not be updated to a 2020 baseline as the US Census data is not yet available). The AECOM Team will run a current base year and future year(2045) Existing plus Committed (E+C) scenario to identify the percent change in traffic volumes along major roadways within the study area. These growth factors will be used to develop future year(2045)turning movements. The model will also be used to analyze up to two (2)build scenarios, such as adding a new roadway connection or modifying roadway capacity. B. Synchro Traffic Modeling a. Existing Conditions The AECOM Team will build an existing traffic model in Synchro of the study area to provide a baseline of comparison against alternative configurations being considered. Synchro models will be created for an AM peak period and PM peak period for up to twenty-eight(28)intersections. Current signal timing plans will be provided by the City of Decatur. b. Future Conditions Using growth factors derived from the Travel Demand Model, AECOM will build a future year traffic model in Synchro of the study area. Growth factors will be applied to existing traffic volumes/turning movements to project future forecast year traffic volumes at each intersection. c. Concepts AECOM will build Synchro models for up to three concepts.We anticipate these concepts will include the following: i. 27th Street Widening AECOM will develop Synchro models for the AM and PM peaks that incorporate the widening of 27th Street from two lanes to four lanes.Additional turn lanes will be added along 271h Street where necessary to facilitate projected traffic volumes. ii. 22nd Street—271h Street Connector AECOM will develop Synchro models for the AM and PM peaks that incorporate a proposed roadway connection between 22nd Street and 27th Street just south of the existing Caterpillar facility. Additional spot intersection improvements will be incorporated where necessary along 22nd Street and 27th Street to facilitate projected traffic volumes. 5