All highways built or maintained by and through federal or state aid shall be designated by numbers and by names, where such highways are known by names, on the directional signs erected along said highways and upon the maps authorized and published by the state. Memorial or other distinctive highways built or maintained by federal or state aid, such as the Bankhead Highway, Craft Highway, Bee Line Highway, Spanish Trail Highway, Brandon Highway, Jefferson Davis Highway, Dixie Highway, Jackson Highway, Lee Highway and such other memorial roads as may hereafter be designated, shall be designated on such markers, signs, and maps by names as well as by numbers.