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growth rate, estimated 2003 traffic volumes were determined. These estimated 2003 <br />ADT and peak hour traffic volumes are shown in Figure 3.4.2, and reflect the <br />changes in the roadway network from the construction of E-470. The 2003 condition <br />is used as the base condition for evaluation of traffic impacts. <br />3.5 Estimated 2003 Traffic Plus Site Generated Traffic <br />Figure 3.5 shows the estimated 2003 traffic from Figure 3.4.2 and includes the site- <br />generated traffic from Figure 3.3. <br />4.0 Future Conditions <br />4.1 Estimated 2020 Future Background Traffic <br />Using the results from the 2020 model generated by the E-470 Public Highway <br />Authority, existing network traffic was adjusted based on the growth rate generated <br />from the 2020 E-470 traffic model for US 85. This growth rate was determined to be <br />slightly above 2 percent per year, and considered a reasonable growth rate for the <br />area. The 2020 future peak hour background traffic and ADT is shown in Figure 4.1. <br />4.2 Total Estimated 2020 Future Traffic <br />The total estimated 2020 future peak hour traffic is shown in Figure 4.2. This traffic <br />includes 2020 background traffic and site-generated truck traffic from Brannan Sand <br />& Gravel Company. <br />5.0 Traffic Operational Evaluation <br />All of the operational evaluation in this study was done using the Highway <br />Capacity Software (HCS), Release 3.1b. This software is based on the methods <br />and procedures found in the Highway Capacity Manual (HCM), 1997 Update to <br />the 1994 Highway Capacity Manual, Third Edition, as applicable. All HCS <br />output can be found in the Appendix. <br />5.1 Existing Condition Level of Service <br />A level of service analysis (LOS) was performed for the intersections of Nome <br />Street and Brighton Road, and Nome Street and US 85. This analysis is presented <br />merely for information purposes, since the 2003 condition, which includes the <br />reconfigured roadway network, will be used as the base condition. The results are <br />shown in Table 5.1. Since there was no conventional way to analyze the Nome <br />St./132nd Ave. & Brighton Rd. intersection, the approach volumes were combined <br />and analyzed as one T-intersection to Brighton Road. <br />10 <br />