OC ▁Trans po ▁R ider ▁Sm art ▁Card , ▁issued ▁by ▁S TO ▁to ▁Ontario ▁residents ▁living ▁within ▁O C ▁Trans po ' s ▁service ▁area , ▁for ▁such ▁tri ps . ▁Pass engers ▁res iding ▁outside ▁O C ▁Trans po ' s ▁service ▁area ▁must ▁pay ▁S TO ▁far es . ▁ ▁S TO ▁P asse - Part out ▁PL US ▁Card ▁readers ▁are ▁unable ▁to ▁ded uct ▁c ash ▁far es ▁from ▁Pr esto ▁card ▁hold ers . ▁As ▁such , ▁the ▁Pr esto ▁cards ▁may ▁not ▁be ▁used ▁to ▁board ▁an ▁S TO ▁bus ▁directly , ▁nor ▁provide ▁companion ▁far es . ▁Pass engers ▁transfer ring ▁to ▁an ▁S TO ▁Express ▁or ▁S TO ▁Inter zone ▁route ▁must ▁pay ▁any ▁fare ▁supp lement s ▁in ▁c ash . ▁ ▁Pr esto ▁ticket ▁ ▁A ▁Pr esto ▁ticket ▁is ▁a ▁single - use , ▁paper ▁ticket ▁with ▁an ▁embedded ▁electronic ▁chip . ▁Like ▁the ▁Pr esto ▁card , ▁users ▁must ▁tap ▁the ▁Pr esto ▁ticket ▁on ▁a ▁Pr esto ▁reader ▁when ▁entering ▁a ▁T TC ▁bus , ▁street car ▁or ▁sub way ▁station . ▁Un like ▁the ▁Pr esto ▁card , ▁the ▁Pr esto ▁ticket ▁is ▁valid ▁only ▁for ▁T TC ▁services ; ▁it ▁cannot ▁be ▁used ▁for ▁any ▁other ▁regional ▁service ▁prov iders ▁or ▁on ▁T TC ▁bus ▁routes ▁operating ▁outside ▁of ▁the ▁City ▁of ▁Toronto , ▁such ▁as ▁those ▁in ▁York ▁Region ▁( n orth ▁of ▁Ste eles ▁Avenue ) ▁and ▁Mississ aug a ▁( west ▁of ▁Pear son