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5.12 TRAFFIC AND TRANSPORTATION <br /> 5.12.1.1.3 State Route 12 <br /> SR 12 is an east-west state highway that provides indirect access to the project site from the <br /> northeast and northwest. It has one or two lanes in each direction in the vicinity of the LEC. <br /> According to Caltrans,the average daily traffic volume on SR 12 near the I-5 interchange is <br /> 22,200 vehicles per day.Trucks are approximately 14 percent of all traffic. <br /> 5.12.1.1.4 State SR 160 <br /> SR 160 is a north-south freeway that connects Contra Costa County to Solano County west <br /> of the project site. In the vicinity of SR 12,SR 160 has one lane in each direction. According <br /> to traffic counts published by Caltrans in 2006,the average daily traffic volume on SR 160 <br /> near the SR 12 interchange is 15,000 vehicles per day. Trucks are approximately 9 percent of <br /> all traffic. <br /> 5.12.1.1.5 North Cord Road <br /> North Cord Road is a north-south roadway that connects the site entrance to North <br /> Thornton Road. It is an undivided facility that has one lane in each direction. According to <br /> San Joaquin County,North Cord Road carries about 30 vehicles per day. <br /> 5.12.1.1.6 West Eight Mile Road <br /> West Eight Mile Road is an east-west roadway that connects 1-5 to North Thornton Road. It <br /> is a five-lane divided facility. According to San Joaquin County,West Eight Mile Road <br /> carries about 11,200 vehicles per day. <br /> 5.12.1.1.7 North Thornton Road <br /> North Thornton Road is a two-lane,north-south,undivided roadway. North Thornton Road <br /> connects West Eight Mile Road to SR 12 to the west. The connection to the eastern segment <br /> of SR 12 and North Thornton Road is via De Broggi Road. According to San Joaquin County, <br /> North Thornton Road carries about 10,000 vehicles per day near Devries Road. <br /> 5.12.1.1.8 De Broggi Road <br /> De Broggi Road is a two-lane, east-west roadway that connects North Thornton Road <br /> directly to the eastern segment of SR 12,and to SR 12 via Star Street. De Broggi Road carries <br /> about 600 vehicles per day. <br /> 5.12.1.2 Existing Traffic Conditions and Level of Service Analysis <br /> The traffic analysis was conducted according to the methodologies and procedures outlined <br /> in the 2000 Highway Capacity Manual (HCM) published by the Transportation Research <br /> Board, and applicable provisions from the California Environmental Quality Act (CEQA). <br /> Average daily traffic for the study area local streets and State facilities were used in the <br /> analysis. Afternoon peak hour turning movement counts were used to assess intersection <br /> level of service (LOS). <br /> 5.12.1.2.1 Existing Roadway Conditions <br /> The 2000 HCM assesses the performance of street and highway systems and the capacity of <br /> roadways by measuring the flow of traffic. LOS is a qualitative assessment of the <br /> quantitative effects of such factors as traffic volume,roadway geometrics,speed, delay, and <br /> maneuverability on roadway and intersection operations. Roadway traffic flow <br /> characteristics for different LOS are described in Table 5.12-1. <br /> 5.12-2 SAC/371322/082380003(LEC_5.12_TRAFFIC_AND_TRANSPORTATION.DOC) <br />