the beach, the majority of the traffic on Fridays and Sundays are cars on weekend trips, creating highly asymmetrical demand. In Washington, D.C., the Rock Creek and Potomac Parkway between the Lincoln Memorial and Calvert St. is converted from two lanes in each direction to one-way southbound in the morning and one-way northbound in the evening rush hour Monday through Friday, excluding federal holidays. The P Street exit, usually unavailable northbound, is an allowed left exit in the evening. South of Virginia Avenue, two lanes are closed during rush hours to facilitate the merge to or from Virginia Avenue. There are no overhead markings, but police barricades block wrong-way entrances to the roadway. Canal Road in Washington, D.C. (between Foxhall Road and Arizona Avenue) Sherman Access in Hamilton, Ontario. 2 lanes total, both marked as reversible, with both lanes flowing in the same direction during rush hour each weekday. Assembly Street and Bluff Road (both part of South Carolina 48), along with Shop Road and George Rogers Boulevard in Columbia, South Carolina, are one-way during University of South Carolina football games at Williams-Brice Stadium. The lower deck of the Centre Street Bridge in Calgary, Alberta, is fully reversible. It normally allows for two-way traffic, but both lanes flow in the same direction during rush hour each day. Victoria Bridge, in Montreal, Quebec, normally allows for two-way traffic. But during rush hours, it only allows one-way traffic, northbound in the morning, and southbound in the afternoon. Farnam Street in Omaha is a normally two-way, two-lane street that during rush hour becomes one-way eastbound in the morning and westbound in the evening. Sierichstraße in Hamburg, Germany, a fully reversible, two-lane city street. The White Nile Bridge connecting Khartoum and Omdurman in Sudan, with 4 lanes total. Traffic is generally directed equally, 2 lanes to Khartoum and to lanes from except in the morning, where it's 3 lanes towards Khartoum, and in the evening, 3 lanes towards Omdurman. In Hong Kong, most vehicular tunnels are dual tube. In the early hours one of the tubes will be closed, and one of the lanes in the other tube carries reversed traffic. The Baker–Barry Tunnel, one of only two means of access to the Marin Headlands from U.S. Route 101 in Marin County, California, is not wide enough to accommodate bidirectional traffic. It consists of a single reversible lane for automobiles and two bicycle lanes.