You've left out some numbers so I can't tell exactly what the options are, but for number three, the only reason I can think of to list I580W is that Mapquest doesn't know that I80 E and I580 W are actually the same highway for several miles as they run through Emeryville and Berkeley (yeah, I know that's weird). Drewski and Robert have given you the two actual options, and which one is better depends on the time of day and the traffic conditions.
↧