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. � <br /> : SCOPE OF SERVICES Page 3 <br /> Traffic counts, commuting patterns (U.S. Census of Transportation), and Illinois <br /> DOT information will be used to prepare a matrix of current trips by category. In <br /> addition, travel data for other regions of similar size and character will be <br /> reviewed. A recommendation will be prepared if an origin/destination or similar <br /> survey will be required (These surveys are not part of this scope of services). <br /> Socio/economic, land use and population data by TAZ (traffic analysis zone) will <br /> be gathered and summarized by the City for use in this project. <br /> Task 5: Develop Traffic Model and Forecasts <br /> The current TRANPLAN network and TAZ system for the study area will be <br /> updated to reflect the new information gathered from Decatur and DUATS. It is <br /> assumed that the TRANPLAN model is fully updated and usable for this project. <br /> The items that are to be checked and modified include: <br /> • Centroid Connectors <br /> • Speeds and Capacities <br /> • Intersection Delays/Penalties <br /> • Intrazonal Times <br /> • One-way/Two-way Street Patterns <br /> • Coding Errors <br /> The product of this task will be a network that depicts the existing physical <br /> characteristics of the roadways. It will also contain the correct definitions for <br /> aggregated network link groups that will be used for subsequent model calibration <br /> and validation. <br /> This task will quantify the Land Use Plans (City and County) in terms of the future <br /> population, housing units, and types of employment in the va�ious TAZs. This <br /> work will be performed by the City and DUATS with the assistance of the <br /> consultant. <br /> The travel demand forecast model for the study area will be updated beginning <br /> with a review of the parameters. Base year socio/economic data will be part of <br /> this review for reasonableness of all indicators. The results will be checked <br /> against other survey results, as well as trip characteristics obtained from other <br /> sources for the region and national average for similar regions. The calibration will <br /> take place on the existing coded DUATS network. <br /> The trip generation models will be checked for: <br /> • Production and Attraction Rates by trip purpose; <br /> • Special Generators Icommercial airport, university, retail malls, etc.); <br /> • Trip Balancing Factors; <br /> • Auto Occu�ancy Rate. <br />