▁l ane ▁markers ▁were ▁manually ▁moved ▁to ▁mark ▁the ▁centre ▁median . ▁ ▁It ▁is ▁possible ▁to ▁see ▁odd ▁arrang ements ▁of ▁flow ▁during ▁night ▁periods ▁when ▁maintenance ▁occurs , ▁which ▁may ▁involve ▁completely ▁closing ▁some ▁lan es . ▁Norm ally ▁this ▁is ▁done ▁between ▁mid night ▁and ▁dawn , ▁because ▁of ▁the ▁enorm ous ▁traffic ▁dem ands ▁placed ▁on ▁the ▁bridge ▁outside ▁these ▁hours . ▁ ▁When ▁the ▁Sydney ▁Har bour ▁T unnel ▁opened ▁in ▁August ▁ 1 9 9 2 , ▁Lane ▁ 7 ▁became ▁a ▁bus ▁l ane . ▁ ▁T oll s ▁ ▁The ▁veh icular ▁traffic ▁lan es ▁on ▁the ▁bridge ▁are ▁operated ▁as ▁a ▁to ll ▁road . ▁As ▁of ▁October ▁ 2 0 1 9 , ▁there ▁is ▁a ▁variable ▁to ll ing ▁system ▁for ▁all ▁vehicles ▁head ed ▁into ▁the ▁C BD ▁( s outh bound ). ▁The ▁to ll ▁paid ▁is ▁dependent ▁on ▁the ▁time ▁of ▁day ▁in ▁which ▁the ▁vehicle ▁passes ▁through ▁the ▁to ll ▁pla za . ▁The ▁to ll ▁var ies ▁from ▁a ▁minimum ▁value ▁of ▁$ 2 . 5 0 ▁to ▁a ▁maximum ▁value ▁of ▁$ 4 . ▁ ▁There ▁is ▁no ▁to ll ▁for ▁north bound ▁traffic ▁( though ▁tax is ▁trav elling ▁north ▁may ▁charge ▁passengers ▁the ▁to ll ▁in ▁anticip ation ▁of ▁the ▁to ll ▁the ▁tax i ▁must ▁pay ▁on ▁the ▁return ▁journey ). ▁In ▁ 2 0 1 7 , ▁the ▁Brad field ▁Highway ▁northern ▁to ll ▁pla za ▁infrastr ucture ▁was ▁removed ▁and ▁replaced