Upper East Siders have finally warmed up to speedy Select Bus Service — but don’t like the MTA’s strict enforcement of its fare-collection rules, a survey has found.

Eighty-one percent of respondents said they used the service, in which express buses zip through designated lanes to beat traffic, according to the poll by City Councilwoman Jessica Lappin.

But Ruben Rivera, 64, complained that he received a $100 fine on an SBS bus although he showed the enforcement agent his transfer card.

SBS riders must show receipts printed from curbside vending machines.

jennifer.fermino@nypost.com