 In March 1968, CR 76 was truncated to begin at NY 347 while CR 78 was extended northwestward over CR 76's former routing to NY 25 in Commack.In 1970, the Nassau–Suffolk Regional Planning Board brought up plans to convert CR 78 into a six-lane expressway with new service roads.A similar project was planned for the nearby four-lane NY 347 through Islip.