At the beginning of the 20th century, there were no road bridge or tunnel crossings between the two states. The initial tunnel crossings were completed privately by the Hudson and Manhattan Railroad in 1908 and 1909 ("Hudson Tubes"), followed by the Pennsylvania Railroad in 1910 ("North River Tunnels"). Under an independent agency, the Holland Tunnel was opened in 1927, with some planning and construction pre-dating the Port Authority. With the rise in automobile traffic, there was demand for more Hudson River crossings. Using its ability to issue bonds and collect revenue, the Port Authority has built and managed major infrastructure projects. Early projects included bridges across the Arthur Kill, which separates Staten Island from New Jersey. The Goethals Bridge, named after chief engineer of the Panama Canal Commission General George Washington Goethals, connected Elizabeth, New Jersey and Howland Hook, Staten Island. At the south end of Arthur Kill, the Outerbridge Crossing was built and named after the Port Authority's first chairman, Eugenius Harvey Outerbridge. Construction of both bridges was completed in 1928. The Bayonne Bridge, opened in 1931, was built across the Kill van Kull, connecting Staten Island with Bayonne, New Jersey.