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Chapter 1 x Executive Summary <br />1-9 <br />improvements and include major infrastructure and operational improvements to enhance traffic <br />and transit operations in the study area such as bus-only, HOV, or express lanes, grade <br />separations, direct connect flyovers, etc. <br />The initial short-term Rail Bridge improvements include several bicycle and pedestrian multiuse <br />path options, which use the Dumbarton Corridor ROW on the Peninsula. Long-term Rail Bridge <br />improvements include a variety of modes that make up the universe of possible long-term transit <br />options including commuter rail, Bus Rapid Transit, Light Rail Transit, BART, Personal Rapid <br />Transit, Group Rapid Transit, People Mover, hyperloop, ferry, and gondola. <br />All initial improvement options were qualitatively evaluated based on the project goals defined <br />above and in Chapter 3. Based on these criteria, the best performing initial improvement options <br />were packaged into a final set of ten project alternatives: <br />ƒƒ Alternative 1: No Build (2020) <br />ƒ Alternative 2: Short-Term Enhanced Bus on Highway Bridge (2020) <br />ƒ Alternative 3: No Build (2040) <br />ƒ Alternative 4: Long-Term Enhanced Bus on Highway Bridge with Reversible Express Lanes <br />(2030) <br />ƒ Alternative 5: Long-Term Enhanced Bus on Highway Bridge with One Express Lane in Each <br />Direction (2030) <br />ƒ Alternative 6: Busway on Rail Bridge (2030) <br />ƒ Alternative 7: Rail Shuttle on Rail Bridge (2030) <br />ƒ Alternative 8: Rail Commuter Single-Track on Rail Bridge (2030) <br />ƒ Alternative 9: Rail Commuter Double-Track on Rail Bridge (2030) <br />ƒ Alternative 10: Combination Bus and Rail (2030) <br />Alternatives 1 and 2 present short-term conditions, including the No Build Alternative (2020) as <br />well as enhanced bus service on the Highway Bridge and corresponding approach improvements. <br />Alternatives 3-10 represent long-term conditions. Alternative 3 presents the long-term No Build <br />condition (2030), to be used as a baseline for analysis. Both No Build Alternatives assume that no <br />improvements will be made to the Dumbarton Highway Bridge and the removal of the <br />Dumbarton Rail Bridge along with any necessary environmental mitigation. Alternatives 4 and 5 <br />provide further enhanced bus service with different express lane options on the Highway Bridge <br />as well as additional approach improvements. Alternatives 6–10 include development of the Rail <br />Bridge and associated ROW. Specifically, Alternative 6 provides enhanced bus service on the Rail <br />Bridge. Alterative 7 provides a commuter rail “shuttle” service on the Rail Bridge. Alternatives 8 <br />and 9 provide commuter rail “commuter” service, with Alternative 8 being single-tracked across <br />the Rail Bridge and Alternative 9 being double-tracked across the Rail Bridge. Alternative 10 <br />provides an optimized combination of alternatives on the Highway Bridge and Rail Bridge. <br />6.1.D. - Page 18