Florida State Road 10 (pre-1945)  SR 10 was defined by number in 1923 state law, chapter 9311, approved June 8, 1923:   SR 10 was extended by number in 1925 state law, chapter 10269, approved June 1, 1925:  SR 10 was slightly realigned by number in 1927 state law, chapter 12300, approved May 13, 1927:  A shortcut was added to SR 10 by number in 1929 state law, chapter 13835, approved June 10, 1929:  A spur was added to SR 10 by number in 1931 state law, chapter 14991:  The same act repealed part of SR 10:  1931 state law, chapter 15652, approved June 26, 1931, did exactly the same thing as chapter 14991. Another spur was added by number in 1931 state law, chapter 15645, approved June 26, 1931:  Certain streets in Panama City were defined as part of SR 10 in 1941 state law, chapter 20292, filed May 12, 1941:  The sections between St. Marks and Panacea and northeast from Newport were never built, though the former was still planned in 1945. Here's what each section became in the 1945 renumbering: