a dual two-lane to a three-lane section. One lane is always dedicated to Northbound (out of town) traffic, and one lane to Southbound (city centre bound traffic) with the centre lane reversing depending on the time of day – i.e. in the morning 2 lanes into the city, 1 lane out, in the evening 2 lanes out of the city, 1 lane in. A1434 in Lincoln (Canwick Road) has a short three-lane section of tidal flow. A38(M) Aston Expressway in Birmingham has 7 lanes, 3 of which are flexible according to rush hour traffic flow direction/time of day. United States Alabama In Montgomery, Norman Bridge Road through the Garden District and Old Cloverdale has a center lane with reversible markings and traffic flow lights between Burton Avenue and Legrand Place. Alaska The Anton Anderson Memorial Tunnel between Portage and Whittier is a 13,300 feet (4,050 m) long, reversible single lane tunnel, shared between vehicular traffic and trains. The direction of traffic alternates every 15 minutes, with periods allowed for train traffic each day. Arizona In Phoenix on 7th Avenue between McDowell Road and Northern Avenue, and 7th Street between McDowell Road and Cave Creek Road/Dunlap Avenue. On both roads, the lane configuration is 2 southbound and 3 northbound, with the center lane open for southbound traffic between 6-9am and open to northbound traffic between 4-6pm. Left turns are prohibited from the reversible lane at most arterial and collector street intersections during these hours but still allowed at driveways and non-signaled street intersections. California Lafayette Street in Santa Clara – the center lane is used for northbound traffic on weekday mornings, southbound traffic for weekday afternoons, and as a center turning lane at other times. Golden Gate Bridge in San Francisco and Marin County – (6 lanes total, 2 reversible with moveable barriers) 4th Street Bridge in Los Angeles – the center lane is used for westbound traffic on weekday mornings, eastbound traffic for weekday afternoons, and as a center turning lane at other times. The San Diego-Coronado Bay Bridge (a portion of California State Route 75) - five lanes with movable center wall; is alternately configured as 3/2 or 2/3 dependent on time of day (westbound mornings, eastbound afternoons) Interstate 15 "Express Lanes" in San Diego County between SR 52 and SR 78 - four lanes with movable center wall; normally configured as 2/2 but can be shifted to 3/1