The Liberty Bridge was dedicated on March 27, 1928. The opening of the tunnels (in 1924) and bridge were responsible for a near quadrupling of property values in the South Hills. On this spring day in 1928, County Commissioner Joseph G. Armstrong's two grandsons undid a ribbon to open the new bridge. For the next 90 minutes, autos four abreast streamed across it. They went through the tunnels and along South Hills streets and roads lined with thousands of residents. Newspapers called it the longest automobile procession in Pittsburgh history. The combined cost of the new tunnels and bridge was $9,400,000.