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Existing Transportation Conditions -- <br /> <br /> freeway interchanges such as 1-680 /Crow Canyon Road and 1-580/Dougherty Road/ <br /> Hopyard Drive. Table 2-1 compares the volnmes to typical capacity ranges. The roads that <br /> are nearing capacity based on ADT are Vasco Road, Vallecitos Road (Highway 84), First _ <br /> Street in Pleasanton, the two-lane section of San Banton Valley Boulevard in San Ramon, <br /> Crow Canyon Road near 1-680, Hopyard Road north o£ Owens, San Ramon Road near <br /> 1-580, Dougherty Road near 1-580, and Dublin Boulevard west of 1-680. First Street in ._ <br /> Pleasanton, however, is a downtown street, and congestion in this location is expected due <br /> to the dense development. <br /> <br /> Freeway Levels of Service <br /> <br /> Level of service descriptions for beth 1-580 and 1-680 were obtained from the 1-680 <br /> Corridor Study Existing Conditions report prepared by TJKM for the Contra Costa <br /> Transportation Authority and from freeway travel times studies prepared by Abrants _ <br /> Associates for the Alameda County Congestion Management Agency. These values are <br /> shown on Figure 2-3. The freeway lane capacity is assumed to be 2,200 vehicles per hour. <br /> <br /> 1-580 operates at LOS C or better in both directions throughout the Tri-Valley area during <br /> peak hours with the exception of a short segment between the 1-580/I-680 interchange and <br /> the Santa Rita Road/Tassajara Road interchange in Pleasanton. This section occasionally <br /> becomes congested during peak hours. 1-680 operates at LOS C or better in beth direc- ' <br /> tions throughout most of the Tri-Valley area. <br /> <br /> However, a section of northbeund 1-680 between Stoneridge and the 1-680/I-580 inter- ' <br /> change occasionally becomes congested during peak hours as does the southbeund <br /> segment between Alcosta and the 1-680/I-580 interchange. All these problems on 1-580 <br /> and 1-680 near the 1-680/I-580 interchange are caused by the interchange design with loop ' <br /> remps and weaving sections. <br /> <br /> The other segments of 1-680 that occasionally become congested are from Crew Canyon '- <br /> Road north to the 1-680/24 interchange. <br /> <br /> Intersection Levels of Service <br /> <br /> The operating conditions at intersections of routes of regional significance and at certain ' <br /> freeway off-/on-rantps were evaluated with level of service calculations. Level of Service is <br /> a qualitative description of an intersection's operation, ranging from LOS A, or free-flow <br /> conditions with little or no delay time at the intersection, to LOS F, or highly congested - <br /> conditions with long delays at the intersection (see Table 2-2). <br /> <br />Barton-Aschman Assodates, Inc. 20 <br /> <br /> <br />