In 1934, the Sumner Tunnel was constructed to connect the North End to East Boston, the location of the then-new Boston Airport (now Logan International Airport) and Boston's formerly second largest predominantly working class Italian American district. In the 1950s the John F. Fitzgerald Expressway (locally known as the Central Artery) was built to relieve Boston’s traffic congestion. Hundreds of North End buildings were demolished below Cross Street, and the Artery walled off the North End from downtown, isolating the neighborhood. The increased traffic led to the construction of a second tunnel between the North End and East Boston; this second tunnel (the Callahan Tunnel) opened in 1961. Although the construction of the Central Artery created years' worth of disorder, in the 1950s the North End had low disease rates, low mortality rates, and little street crime. As described by Jane Jacobs in "The Death and Life of Great American Cities", in 1959 the North End's "streets were alive with children playing, people shopping, people strolling, people talking. Had it not been a cold January day, there would surely have been people sitting. The general street atmosphere of buoyancy, friendliness, and good health was so infectious that I began asking directions of people just for the fun of getting in on some talk."