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~_ C. Update Future Trip Generation and Attraction Data Update design year employment and dwelling unit information for the zones in the Ferry Street Bridge area. (As with task B, a parallel effort for the remainder of the metropolitan area will be accomplished under the work activit~ies included in L-COG's Unified Planning Work Program.) The Metropolitan Plan's population and employment assumptions _. (plus some additional empl.oyment at the Special Light.Industrial sites) are currently used in the'TransPlan model. At leas.t some adjustments should be considered for the Riverfront area and downtown Eugene since development now expected may differ from that assumed for TransPlan. The data prepared for CATS should provide a starting point. The "new Metropolitan Plan" forecasts could be used and a couple alternative development scenarios could also be tested. D. Peak Hour Model Develop a peak hour model as a replacement to or supplement of the existing 24-hour model. In discussions with Eugene staff and the proj- ect's traffic consultant, it was determined a peak hour model would be extreme]y useful for the Ferry Street Bridge analysis. A peak hour model is thougfit to be more useful for pro;ject specific analysis than the existing 24-hour model. The biggest advantage of a peak hour model is that it would directly provide design hour volumes for the Ferry Street Bridge ana_lysis. A peak hour model would give us the option of using some of the UTPS features, such as capac.ity restraint, which are not available or not useful with the 24-hour model. The main tasks required of L-COG staff would be development of new trip production and attraction equations and calibration to existing ground counts through link speed adjustments. A major effort might be required of Eugene, Springfield and Lane County staff to furnish valid peak hour ground counts. Ideally, peak hour counts would be taken on all links. By developing peak hour factors, counts at selected.locations could be used to convert recent 24-hour counts to peak hour counts at other locations. E. Model Runs and Forecasting of Volumes Running of the model can be divided into two categories: "regional" and "site-specific." Although there would be little difference in the actual computer use, the coding and analysis would be different. Regional modeling would provide the traffic volume forecasts to evaluate major alternatives includi'ng: testing of a Valley River Bridge, testing of I-5 ramps and interchanges, testing of some new locations for an additional bridge, and testing of improvements in the existing Ferry Street Bridge corridor. Because a variety of possibilities were evalu- ated during develop,ment of TransPlan, relatively few test networks would be required for the regional modeling phase. Site-specific modeling would focus on tests of differing ramp configura- tions and access alignments for both the south and north ends of the primary alternative developed in the regional modeling phase. Because of the number of alternati.ve configu"rations available, considerably more work would be devoted to this phase than the regional modeling phase.