A Cumberland Gap warning sign on SB I-75/EB TN St Rt 63. Warning sign for trucks. This is for the Cumberland Gap Tunnel. Sign is located on NB I-81. BGS on NB I-81. A BGS on NB I-81. NB U.S. Rt. 25E; TN St Rt 32/113 north of I-81. NB U.S. Rt. 25E; TN St Rt 32/113 north of TN St Rt 343. NB U.S. Rt. 25E/TN St Rt 32 north of TN St Rt 113. A junction marker on NB TN St Rt 343.