. ▁ ▁T idal ▁flow ▁The ▁bridge ▁is ▁equ ipped ▁for ▁tid al ▁flow ▁operation , ▁perm itting ▁the ▁direction ▁of ▁traffic ▁flow ▁on ▁the ▁bridge ▁to ▁be ▁alter ed ▁to ▁better ▁suit ▁the ▁morning ▁and ▁evening ▁r ush ▁hours ' ▁traffic ▁patterns . ▁ ▁The ▁bridge ▁has ▁eight ▁lan es ▁in ▁total , ▁number ed ▁one ▁to ▁eight ▁from ▁west ▁to ▁east . ▁L anes ▁three , ▁four ▁and ▁five ▁are ▁revers ible . ▁One ▁and ▁two ▁always ▁flow ▁north . ▁Six , ▁seven , ▁and ▁eight ▁always ▁flow ▁south . ▁The ▁default ▁is ▁four ▁each ▁way . ▁For ▁the ▁morning ▁r ush ▁hour , ▁the ▁l ane ▁changes ▁on ▁the ▁bridge ▁also ▁require ▁changes ▁to ▁the ▁W arring ah ▁Fre ew ay , ▁with ▁its ▁inner ▁western ▁revers ible ▁carriage way ▁direct ing ▁traffic ▁to ▁the ▁bridge ▁l ane ▁numbers ▁three ▁and ▁four ▁south bound . ▁ ▁The ▁bridge ▁has ▁a ▁series ▁of ▁overhead ▁g ant ries ▁which ▁indicate ▁the ▁direction ▁of ▁flow ▁for ▁each ▁traffic ▁l ane . ▁A ▁green ▁arrow ▁pointing ▁down ▁to ▁a ▁traffic ▁l ane ▁means ▁the ▁l ane ▁is ▁open . ▁A ▁flash ing ▁red ▁" X " ▁indicates ▁the ▁l ane ▁is ▁closing , ▁but ▁is ▁not ▁yet ▁in ▁use ▁for ▁traffic ▁trav elling ▁in ▁the ▁other ▁direction . ▁A ▁static ▁red ▁" X " ▁means ▁the ▁l ane ▁is ▁in ▁use ▁for ▁on coming ▁traffic . ▁This ▁arrangement ▁was ▁introduced ▁in ▁the ▁ 1 9 9 0 s , ▁replacing ▁a ▁slow ▁operation ▁where