3 2 , ▁three ▁post age ▁st amps ▁were ▁issued ▁to ▁comm emor ate ▁the ▁im min ent ▁opening ▁of ▁the ▁bridge . ▁Several ▁songs ▁were ▁composed ▁for ▁the ▁occasion . ▁In ▁the ▁year ▁of ▁the ▁opening , ▁there ▁was ▁a ▁ste ep ▁rise ▁in ▁b ab ies ▁being ▁named ▁Arch ie ▁and ▁Br idget ▁in ▁honour ▁of ▁the ▁bridge . ▁ ▁The ▁bridge ▁itself ▁was ▁regarded ▁as ▁a ▁triumph ▁over ▁De pression ▁times , ▁ear ning ▁the ▁nick name ▁" the ▁Iron ▁L ung ", ▁as ▁it ▁kept ▁many ▁De pression - era ▁workers ▁employed . ▁ ▁Oper ations ▁In ▁ 2 0 1 0 , ▁the ▁average ▁daily ▁traffic ▁included ▁ 2 0 4 ▁trains , ▁ 1 6 0 , 4 3 5 ▁vehicles ▁and ▁ 1 6 5 0 ▁b icy cles . ▁ ▁Road ▁ ▁From ▁the ▁Sydney ▁C BD ▁side , ▁motor ▁vehicle ▁access ▁to ▁the ▁bridge ▁is ▁normally ▁via ▁Gros ven or ▁Street , ▁Clar ence ▁Street , ▁Kent ▁Street , ▁the ▁C ah ill ▁Express way , ▁or ▁the ▁Western ▁Dist rib utor . ▁D ri vers ▁on ▁the ▁northern ▁side ▁will ▁find ▁themselves ▁on ▁the ▁W arring ah ▁Fre ew ay , ▁though ▁it ▁is ▁easy ▁to ▁turn ▁off ▁the ▁fre ew ay ▁to ▁drive ▁west wards ▁into ▁North ▁Sydney ▁or ▁east wards ▁to ▁Ne ut ral ▁Bay ▁and ▁beyond ▁upon ▁arrival ▁on ▁the ▁northern ▁side . ▁ ▁The ▁bridge ▁originally ▁only ▁had ▁four ▁wider ▁traffic ▁lan es ▁occup ying ▁the ▁central ▁space ▁which