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Chapter 1 x Executive Summary <br />1-8 <br />Figure 1-4: Freight Rail Subdivisions in the DTCS Study Area <br /> <br /> <br />1.3 Alternatives Development <br />The alternatives were developed in a two-step process, starting with consideration of a wide <br />range of initial improvement options applicable to the Highway Bridge and its approaches, the <br />Rail Bridge and other transbay crossing options that would not require either bridge. The initial <br />screening, as described in Chapter 6, determined which initial improvement options would be <br />carried forward for further analysis. Initial improvement options carried forward for further <br />analysis were then packaged as alternatives, developed in greater detail, and evaluated again in a <br />comparative analysis (Chapter 11). <br />Short-term and long-term initial improvement options for the Highway and Rail Bridge (screened <br />in the initial screening process) are summarized below as well as in Chapter 5. <br />While there are no short-term improvements on the Highway Bridge itself, there are approach <br />improvements that could enhance mobility in the Corridor with an emphasis on bus transit and <br />other high-occupancy vehicles (HOVs). These options include improvements to the Dumbarton <br />Bridge toll plaza, park-and-ride facilities, roadway infrastructure, traffic and transit operations, <br />transit service, bicycle and pedestrian access, as well as other strategies to improve mobility and <br />access. Long-term options for the Highway Bridge and its approaches build upon the short-term <br />6.1.D. - Page 17