" ▁of ▁operating ▁parts ▁of ▁Pr esto ▁and ▁the ▁legacy ▁fare ▁reg imes ▁concurrent ly ▁over ▁the ▁next ▁few ▁years . ▁A ▁situation ▁T TC ▁board ▁member ▁John ▁Campbell ▁describes ▁as ▁" tot ally ▁in efficient ". ▁ ▁In ▁its ▁annual ▁report ▁released ▁in ▁ 2 0 1 8 , ▁Met rol inx ▁indicated ▁it ▁expected ▁the ▁cost ▁of ▁the ▁Pr esto ▁system ▁to ▁reach ▁$ 1 . 2 b ill ion , ▁with ▁$ 1 b ill ion ▁already ▁spent ▁in ▁the ▁development ▁and ▁implementation ▁the ▁system ▁between ▁ 2 0 0 2 ▁and ▁March ▁ 2 0 1 8 . ▁While ▁Pr esto ▁was ▁designed ▁for ▁complex ▁fare ▁transactions ▁between ▁G TA ▁trans it ▁ag encies , ▁up ▁until ▁the ▁fourth ▁quarter ▁of ▁ 2 0 1 9 , ▁the ▁system ▁on ▁T TC ▁bus es ▁was ▁not ▁able ▁to ▁support ▁the ▁payment ▁of ▁special ▁sur charg es ▁for ▁T TC ▁express ▁dow nt own ▁bus es ▁and ▁T TC ▁tri ps ▁that ▁enter ▁Mississ aug a ▁and ▁York ▁Region ▁where ▁a ▁Mi way ▁or ▁Y RT ▁fare ▁was ▁required . ▁, ▁the ▁T TC ▁Pr esto ▁system ▁at ▁large ▁continues ▁to ▁experience ▁ab norm ally ▁high ▁failure ▁rates . ▁This ▁led ▁to ▁an ▁estimated ▁loss ▁of ▁at ▁least ▁$ 3 . 4 ▁million ▁in ▁re venue ▁in ▁ 2 0 1 8 ▁alone ▁according ▁to ▁the ▁T TC . ▁The ▁ 2 0 1 8 ▁Aud it ▁Work ▁Plan ▁by ▁the ▁aud itor ▁general ▁of ▁Ontario ▁noted ▁that ▁the ▁number