  4 0 9 , ▁which ▁mer ges ▁with ▁the ▁main line ▁and ▁forms ▁the ▁collect or ▁lan es . ▁It ▁returns ▁to ▁its ▁east ward ▁route ▁through ▁Toronto , ▁now ▁carrying ▁ 1 2 – 1 6   lan es ▁of ▁traffic ▁on ▁four ▁carriage ways . ▁Highway   4 0 1 ▁is ▁often ▁con g ested ▁in ▁this ▁section , ▁with ▁an ▁average ▁of ▁ 4 4 2 , 9 0 0   ve h icles ▁passing ▁between ▁West on ▁Road ▁and ▁Highway   4 0 0 ▁per ▁day ▁as ▁of ▁ 2 0 0 8 . ▁In ▁spite ▁of ▁this ▁con g estion , ▁it ▁is ▁the ▁primary ▁comm uting ▁route ▁in ▁Toronto ; ▁over ▁ 5 0   percent ▁of ▁vehicles ▁bound ▁for ▁dow nt own ▁Toronto ▁use ▁the ▁highway . ▁ ▁East ▁of ▁Highway   4 0 0 ▁is ▁The ▁B asket we ave , ▁a ▁cr iss - cross ing ▁transfer ▁between ▁the ▁express ▁and ▁collect ors ▁carriage ways , ▁beyond ▁which ▁is ▁York dale ▁Centre . ▁Tw elve ▁lan es ▁pass ▁beneath ▁a ▁complicated ▁inter change ▁with ▁Allen ▁Road , ▁built ▁to ▁serve ▁the ▁cancel led ▁Sp ad ina ▁Express way . ▁Further ▁east , ▁the ▁highway ▁cross es ▁Hog g ' s ▁H ollow , ▁over ▁the ▁West ▁Don ▁River ▁and ▁Y on ge ▁Street ▁in ▁the ▁centre ▁of ▁Toronto , ▁the ▁bus iest ▁multi - span ▁bridge ▁crossing ▁in ▁North ▁America , ▁sur pass ing ▁the ▁Brook lyn ▁Bridge . ▁It ▁then ▁cross es