SU0004094 - Laserfiche WebLink

Home Browse Search

Revised Traffic Impact Study March 27,2008 — Proposed CEMEX Mining Site Page 5 with-Project traffic volumes for Haul Routes 1 and 3 are presented in Figures 11 and 12, — respectively. 5.5—Cumulative Year 2025 Traffic Volumes The San Joaquin County travel model is maintained by the San Joaquin County Council of Governments (SJCCOG). The model includes peak-hour directional travel volume estimates for the base year 1999 and for the future year 2025. Travel model data provided by SJCCOG is presented in Appendix A. The future peak-hour volumes were estimated base on the Increment Method described in the Council of Fresno County Governments Recommended Procedures for Using Traffic Projections from the Fresno COG Travel Model dated January 2002. Although the — Increment Method was developed for the Fresno County model, it is the opinion of Peters Engineering Group that the methods are applicable to other travel models. The Increment Method estimates the future growth in traffic volumes by determining the difference between the year 2025 — travel model and the base year travel model volumes. This difference indicates the growth in traffic volumes that is predicted by the model between the base year and the year 2025. This growth is then added to the existing volumes determined by actual traffic counts. Future turning movements were — determined based on the methods presented in Chapter 8 of the Transportation Research Board National Cooperative Highway Research Program Report 255 entitled "Highway Traffic Data for Urbanized Area Project Planning and Design". In some instances, the travel model predicted negative growth. However, a minimum annual growth rate of 2.5 percent was maintained for each turning movement. Since travel models can be unreliable in rural areas, this minimum growth rate was applied to maintain a conservative approach to the anticipated growth in traffic volumes. Based on data provided in the Draft Environmental Impact Report dated September 10, 1993 by ESA for the Granite Construction Company project, the average daily traffic volume on SR 132 was 13,500 in 1992. Data available on the Caltrans web site (www.dot.ca. og v/hq/traffops/saferesr/trafdata/2006all/rl18133i.html indicates an average daily traffic volume of approximately 18,700 in 2006. This equates to an average annual growth rate of 2.35 percent. Therefore, a minimum growth rate of 2.5 percent was maintained for purposes of this — report. Cumulative year 2025 traffic volumes without the Project are presented in Figure 13. Cumulative year 2025 traffic volumes with the Project for Haul Routes 1 and 3 are presented in Figures 14 and 15,respectively. — 5.6—Passenger-Car Equivalents The 2000 Highway Capacity Manual published by the Transportation Research Board defines the passenger-car equivalent (PCE) as the number of passenger cars displaced by a single heavy vehicle of a particular type under specified roadway, traffic, and control conditions. To account for the presence of heavy vehicles,a PCE of 2.0 is applied to heavy vehicles for purposes of the intersection analyses. The percentage of heavy vehicles in the existing traffic volumes was determined based on 24-hour vehicle classification counts or was obtained from 2005 Annual Average Daily Truck Traffic on the California State Highway System dated November 2006 by the State of California Department of Transportation.