The street arrangement has seen few changes, except for conversion of the narrow streets to one way traffic and widening of Olive and Market Streets through 1923 bond issue funds. Twelfth Street from Chestnut to St. Charles owes its unusual width to the former presence of the Lucas markets in its center; the widening extensions beyond that were also accomplished with bond funds. Street changes have been made as part of the Stadium, riverfront park and Convention Center projects. Major aids to traffic movement have been the recent completion of expressways such as U.S. 40, and interstate highways 44, 55, 64 and 70. Access to Illinois has been materially aided by completion of the Poplar Street bridge in 1967 and earlier by the Veteran's Memorial (now Martin Luther King) bridge in 1951.