Messier Mercer Mess? Engineers plan for back-ups at Seattle tunnel’s north portal

A messier Mercer Mess? Engineers plan for back-ups at Seattle tunnel’s north portal. WSDOT and SDOT plan to use signal technology to prevent traffic on the SR 99 tunnel’s Mercer Street off-ramp in South Lake. KING 5’s Amanda Grace reports: More info on Messier Mercer Mess? Engineers plan for back-ups at Seattle tunnel’s north portal

source https://seattlepalate.com/media/messier-mercer-mess-engineers-plan-for-back-ups-at-seattle-tunnels-north-portal/