Royal Street heads north from historic Fort Condé through the central business district. The street converted from one-way northbound to two-way traffic in 2003.
Until 1941, Royal Street was a part of the original U.S. 90 alignment through Downtown Mobile. U.S. 90 used Royal Street between Goverment and St. Louis Streets as part of its loop north to the Cochrane Bridge. When the Bankhead Tunnel was completed, U.S. 90 was realigned.
A number of mast-arm signals were removed along St. Louis Street north of Downtown Mobile. Alphonso Mason provided an explanation for the missing signals:
There is history behind most of those traffic signals in Downtown Mobile being removed and replaced with stop signals. During the 1970s, 24″ Crouse Hind signals with metal sun visors used to be erected on those older style mast arms along the inner downtown area (running north-south from St Anthony Street to Conti Street; running east-west from Royal Street to Claiborne Street/Martin Luther King Avenue). Hurricane Frederic in September 1979 blew away most of those traffic signals off of those mast arms. I recall those traffic signals on Dauphin Street at Joachim and Jackson Streets the only ones survived the storm fully intact. Frederic only accelerated the (brief) decline of Downtown Mobile. At one point, older traffic signals replaced some of the destroyed Crouse Hind signals at some of the downtown streets. Eventually, the traffic signals were taken down at downtown intersections never seeing traffic.