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<br />7.A <br />Page 32 <br /> <br />. Trench (covered/uncovered) <br />. Tunnel <br /> <br />Group 1 - advantages <br />Aerial <br /> <br />. Creates usable real estate <br />. Minimizes construction right of way impact <br />. Relatively low cost <br />. Least construction impact compared to tunneling, excavating <br />. More visual and actual community connectivity <br />. Low suicide! vandalism/ terrorism potential <br />. More aesthetic ride <br />Open Trench <br />. Little visual impact <br />. Less noisy than aerial <br />. Pedestrian safety relative to at-grade <br />Covered Trenches <br />. Less visual impact than open; no fences <br />. Connectivity <br />. Usable space above <br />. N olse <br />Deep Tunnel for HSR <br />. Noise (for HSR) <br />. Narrow Right of Way <br />HSR Covered Trench / Caltrain Aerial <br />. Station option exists <br />. Less construction Right of Way <br />. Connectivity <br /> <br />Group 2 - advantages <br />Aerial <br /> <br />. Less expensive and. disruptive <br />At-grade <br />. 4D segment: less expensive <br />Trench (covered/uncovered) <br />. Minimal sound (sideways) <br />. No visuals <br />. Take advantage of the land on top -7 recover land (green space) <br />. Stacked covered trench: less space, less disruption, less right of way -7 <br />double stack trench <br /> <br />Tunnel <br /> <br />. Less property taken (less eminent domain) <br />. Noise minimized. <br />. Aesthetics <br />