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2 SOURCE IDENTIFICATION <br />The California Department of Transportation (Caltrans), Traffic and Vehicle Data Systems Unit <br />collects and maintains traffic volume counts for vehicles traversing the California state highway <br />system. Table 2-1 presents the annual average daily traffic volumes (AADT) for the freeway <br />segment considered in the assessment. <br />TABLE 2-1 FREEWAY TRAFFIC VOLUMES <br />Roadway Segment <br />AADT <br />Vehicles Per Hour (ALL) <br />Vehicles Per Hour (gas) <br />Vehicles Per Hour (diesel) <br />1-5 Freeway <br />329,500 <br />13,729 <br />13,189 <br />540 <br />