14 bridges were replaced on I93, each within 55 hours, in 2011. http://archive.boston.com/news/local/massachusetts/articles/2011/06/04/quick_fix_for_i_93_bridg

14 bridges were replaced on I93, each within 55 hours, in 2011. http://archive.boston.com/news/local/massachusetts/articles/2011/06/04/quick_fix_for_i_93_bridges_begins_large_traffic_jams_expected/ http://archive.boston.com/news/local/massachusetts/articles/...