: Mil it ary ▁units ▁and ▁form ations ▁of ▁the ▁Royal ▁Air ▁Force ▁Category : Command ▁and ▁control <0x0A> </s> ▁The ▁Jack ▁Lyn ch ▁T unnel ▁( I r ish : ▁T oll án ▁She á in ▁U í ▁Lo ings igh ) ▁is ▁an ▁imm ers ed ▁t ube ▁tunnel ▁and ▁an ▁integral ▁part ▁of ▁the ▁N 4 0 ▁southern ▁ring ▁road ▁of ▁C ork ▁in ▁Ireland . ▁It ▁is ▁named ▁after ▁former ▁T ao ise ach , ▁Jack ▁Lyn ch , ▁a ▁native ▁of ▁C ork . ▁ ▁It ▁takes ▁the ▁road ▁under ▁the ▁River ▁Lee . ▁North ▁of ▁the ▁tunnel , ▁the ▁ring - road ▁joins ▁the ▁M 8 ▁motor way ▁to ▁Dublin ▁( n orth ) ▁and ▁N 8 ▁road ▁to ▁the ▁city ▁centre ▁( west ), ▁with ▁the ▁N 2 5 ▁comm encing ▁east ▁to ▁Water ford . ▁The ▁tunnel ▁was ▁completed ▁in ▁May ▁ 1 9 9 9 , ▁and ▁carried ▁nearly ▁ 4 0 , 0 0 0 ▁vehicles ▁per ▁day ▁as ▁of ▁ 2 0 0 5 . ▁This ▁number ▁rose ▁further ▁as ▁the ▁N 4 0 ▁ring - road ' s ▁up gr ades ▁progress ed , ▁with ▁the ▁opening ▁of ▁the ▁K ins ale ▁road ▁round about ▁fly over ▁in ▁ 2 0 0 6 ▁and ▁subsequent ▁up gr ades ▁to ▁the ▁S ars field ▁Road ▁and ▁Band on ▁Road ▁Round about s . ▁Tra ffic ▁in ▁ 2 0 1 5 ▁was ▁ 6 3 , 0 0 0 ▁vehicles ▁a ▁day