port ▁Corporation ▁in ▁August ▁ 1 9 5 9 ▁in ▁a ▁plan ▁submitted ▁to ▁the ▁Ministry ▁of ▁Transport . ▁Work ▁started ▁on ▁ 1 0 ▁September ▁ 1 9 6 2 ▁and ▁both ▁structures ▁were ▁complete ▁and ▁open ▁to ▁traffic ▁by ▁ 1 9 6 7 . ▁ ▁Al most ▁as ▁soon ▁as ▁the ▁M 4 ▁New port ▁by pass ▁( j unction s ▁ 2 4 - 2 8 ) ▁had ▁opened , ▁the ▁traffic ▁levels ▁had ▁grown ▁to ▁such ▁a ▁degree ▁that ▁the ▁road ▁had ▁to ▁be ▁w iden ed ▁to ▁three ▁lan es ▁in ▁each ▁direction . ▁This ▁was ▁finished ▁in ▁ 1 9 8 2 ▁but ▁with ▁the ▁exception ▁of ▁the ▁t unn els ▁and ▁U sk ▁bridge ▁which ▁remained ▁as ▁dual ▁two - lane ▁sections . ▁During ▁the ▁original ▁construction ▁several ▁houses ▁on ▁Bry ng las ▁Road ▁( where ▁the ▁modern ▁New port ▁L odge ▁Hotel ▁now ▁stands ) ▁had ▁to ▁be ▁demol ished ▁due ▁to ▁struct ural ▁weak ness es ▁caused ▁by ▁the ▁t unn elling . ▁Therefore ▁the ▁technical ▁challeng es ▁and ▁risk ▁associated ▁with ▁w iden ing ▁the ▁existing ▁t unn els ▁in ▁a ▁highly ▁built - up ▁area ▁were ▁found ▁to ▁be ▁too ▁great . ▁The ▁t unn els ▁remain ▁a ▁bott l ene ck ▁on ▁the ▁motor way ▁and ▁as ▁of ▁ 2 0 1 1 ▁a ▁new ▁by pass ]] ▁south ▁of ▁the ▁city ▁has ▁been ▁proposed , ▁the ▁M 4 ▁relief ▁road . ▁ ▁Bry ng las ▁House ▁Currently ▁is ▁the