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mainline traffic capacity and Dublin Blvd.'s extension also appear to minimize eastbound cut-through traffic coming from 1-580 and using city streets. Investigation of Regional Cut-Through Traffic Mitigation Using Increased Regional Network Capacity: The model was used to investigate the effects of increasing capacity on two regional facilities: Highway 84 and 1-580. As expected, capacity increases reduce volumes on city streets in the peak hour. Hiehwav 84: The Year 2025 base model was modified to include a four-lane Highway 84 from Stanley Blvd. to 1-680 at Scott's Comer. No additional capacity was assumed either at the 1-580 northerly end or the 1-680 southerly end. The model shows a four-lane thoroughfare would be quickly utilized by traffic traveling both northbound and southbound in mornings and afternoons. This traffic, which in the base model runs shows up on various cut-through routes through Pleasanton, indicates the very large growth in Tri- Valley employment assumed in the model rtms and its attraction of work trips from every direction. Table 3 shows the net changes in traffic projected by the model. There is not a one-for-one reduction of traffic on Pleasanton streets for traffic added to Highway 84. As traffic shifts to Highway 84, congested local streets gain available capacity, which then become more attractive to local users of these routes. 1-580 traffic is reduced, but only by about 400 vehicles. Traffic seeking to use 1-580 quickly fills the capacity left by new Highway 84 users. Furthermore, the model does not project any appreciable net change on routes used by regional cut-through traffic to avoid the 1-580/I-680 interchange. Overall, the Highway 84 expansion results in less traffic on city regional cut-through routes, particularly the Sunol-First / Bemal-Stanley route in both directions in both mornings and afternoons. This model mn shows that improving regional network capacity can have significant benefits to Pleasanton drivers, both in reducing overall traffic and congestion and by freeing capacity for local users wishing to use the city's streets. 1-580: For the 1-580 capacity modification, the model assumed one new eastbound lane from Hacienda Dr.(where one through lane is currently "dropped") easterly to Vasco Rd. This is in addition to the Year 2025 model assumption of a new eastbound HOV lane. This model mn did not include the Highway 84 capacity increase described above. Because of the new lane, ramp-metered volumes were increased to take advantage of the new capacity, but they remained metered. Table 4 summarizes the changes in traffic volumes. The additional lane becomes fully utilized east of E1 Charro Rd. in the afternoon peak hour, but there was no significant change in the morning eastbound volume. As would be expected, westbound volumes did not significantly change as no new capacity was given to this direction. 13