The rising popularity of automobiles led to widening of roads and creation of Northeast (Roosevelt) Boulevard in 1914, the Benjamin Franklin Parkway in 1918, the changing of many existing streets to one-way streets in the early 1920s, and construction of the Delaware River (Benjamin Franklin) Bridge to New Jersey in 1926. Philadelphia began to modernize, steel and concrete skyscrapers were constructed, old buildings were wired for electricity, and the city's first commercial radio station was founded. In 1907, the city constructed the first subway. It hosted the Sesqui-Centennial Exposition in South Philadelphia, and in 1928 opened the Philadelphia Museum of Art.