Of the many freeway exits (from I-880 and 980) that lead to Alameda, there are atleast three that are counter-intuitive and have caused endless confusion for folks new to area.
1. 880-North -> Broadway Exit -> Left on Broadway -> “weird partial U-turn” at the first light into Webster Tube.
2. 980-West -> Jackson St Exit -> Left on Jackson -> Left on 6th Street -> It looks like you are back on the on-ramp for 880-North, but follow signs for Broadway -> Left on Broadway -> Follow above directions (“weird partial U-turn” etc).