 By 1961 , the highway had been shifted westward , but a spur of the Gulf , Colorado and Santa Fe Railroad had been constructed along the approximate location of the highway 's present route . On October 24 , 1985 , SH 168 was approved for designation by the Texas Transportation Commission ( TTC ) , and on April 18 , 1986 the highway was officially designated by the TxDOT 's Administration Circle . At the time , the road was approximately 0 @.@ 5 miles ( 0 @.@ 80 km ) in length . By 1994 , the highway had been extended to approximately 0 @.@ 9 miles ( 1 @.@ 4 km ) in length , due to an extension of its northern terminus . 
