In the tunnel: Dust is blown from the worksite in the Mt. Washington transit tunnel on the South Side. Light rail track near the Station Square Station is currently being replaced; during the work, Port Authority buses and the Blue and Red Lines are detouring through Allentown and down Arlington Avenue. (Photo by Darrell Sapp/Post-Gazette) #Pittsburgh #PGH #412 #PortAuthority #traffic #Pittsburghtraffic #construction #Pittsburghconstruction #PGPhotos