Say goodbye to the two-for-one special at the 6 train’s 138th Street–Third Avenue station – new fare gates are now preventing riders from paying once and entering with a second person.

Those who try to double up will find the gate slamming shut and the sound of a loud horn.

The goal is to stop turnstile hopping. Unless someone has an unusually high vertical jump or is willing to crawl along the floor – getting through without paying is no longer an option.

“It’s only a matter of time before people figure it out,” another rider said.

Some have already tried. One man waited for a passenger to exit, then rushed the gate before it fully closed.

News 12 asked passengers if they would crawl underneath, one woman said, “Yeah, I was going to do that, but I saw you guys.”

She ended up paying.

Until riders fully adjust, customer service agents are stationed nearby to help those having trouble using the new gates. So far, many riders say the gates are working.

“I haven’t seen anyone hop them yet,” one commuter said.

Still, not everyone agrees with how the MTA is spending its money.

“I think it should’ve been put toward the trains — scheduling, running time — but that’s just my opinion,” another rider said.

The gates are part of a larger transformation happening across the city, aimed at stopping fare evasion and moving riders exclusively to tap-to-pay options such as OMNY. The MTA plans to replace more doors over the next several months.