WJZ Eyewitness News At 5 May 1, 2012
crews inject material inside. deputy transportation director frank murphy says the real digging has yet to start. >> we haven't really gotten down low to see what has started there. but we know enough to know that there has been strength in this. we always knew this was going to be part of the work. >> reporter: right now, the northbound closures are scheduled through monday but could last longer. and southbound lanes may eventually close. >> these closures may be a regular feature overnight. for at least a number of weeks. >> reporter: the northbound tour will take you over from 28t...