The　Urban　Traffic　Link　Tunnel　(UTLT)　is　an　innovative　underground　transportation　system　for　the　modern　metropolis,　typically　consisting　of　a　main　tunnel　and　several　linked　tunnels.　To　provide　proper　fire　protection　to　the　UTLT　structure,　the　maximum　temperature　beneath　the　ceiling　needs　to　be　determined.　However,　as　the　effective　height　of　the　UTLT　is　lower　than　that　of　a　normal　tunnel,　the　maximum　temperatures　under　the　UTLT　ceiling　are　different　from　those　in　normal　tunnels.　A　theoretical　analysis　and　CFD　simulation　were　performed　in　this　work　to　estimate　the　maximum　temperature　under　the　ceiling　in　UTLT.　The　smoke　temperatures　at　0.2　m　under　the　ceiling　of　the　UTLT　were　computed　for　different　heat　release　rates,　longitudinal　ventilation　velocities,　and　tunnel　heights.　Based　on　the　simulation　results,　a　new　semiempirical　model　for　the　maximum　temperature　under　the　ceiling　during　UTLT　fires　has　been　developed.　The　comparison　of　the　new　model　predictions　with　experimental　data　indicates　that　the　model　can　predict　experimental　results　fairly　well　and　is　suitable　for　the　UTLT　fire　protection　design.