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interchange and the Grant Line Road and 48,000 vehicles per day respectively. interchange. It is a two-lane, rural road Byron Bethany Road (J4) serves approxi- situated on hilly terrain. mately 5,200 vehicles per day, between Mountain House Road and Patterson Pass Traffic Volumes: Road. Mountain House Road serves between 2,780 and 2,930 vehicles per day. Traffic count data were obtained for this The section of Altamont Pass Road, west of study from Caltrans Districts 4 and 10, Dyer Road, serves 2,460 vehicles per day. Alameda County, and San Joaquin County. The section of Patterson Pass Road, north of (Source: "1987 Traffic Volumes on the Grant Line Road, serves approximately 600 California State Highway System," State of vehicles per day. California, Department of Transportation, Sacramento, California). Figure 5 illustrates Roadway Capacities: a compilation of average annual daily traffic volumes (AADT) for roadways in the Traffic volumes are useful in understanding vicinity of the project site. These counts are the general nature of traffic in an area; the most current available from local however,traffic volumes alone do not sources. indicate the ability of the street network to carry traffic. To provide a measure of the As shown in Figure 5, the largest traffic current level of roadway use, the estimated volumes in the study area occur along I-580 daily capacity of each roadway facility in and I-205. These freeways serve 68,000 the study area is cited below in Table 2. Table 2: Typical Roadway Capacities Average Daily Traffic Volumes Roadway Type Average ADT Max.ADT 8-Lane Freeway 80,000- 100,000 200,000 6-Lane Freeway 60,000 - 75,000 150,000 4-Lane Freeway 40,000- 50,000 75,000 4-Lane Expressway 20,000 - 35,000 50,000 4-Lane Arterial 17,000- 22,000 45,000 2-Lane Arterial 9,000- 13,000 20,000 Site Description 3.7