Step 4 - Alaskan Way Viaduct Project (southeast view)
A. Continue work on southbound SR 99 lanes.
B. Construct southbound SR 99 detour off-ramp to S. Atlantic Street.
C. Detour route for Alaskan Way S. under SR 99 permanently closed in Fall 2011.
D. Alaskan Way S. and First Avenue S. connected using Railroad Way S.
E. SR 99 detour construction begins