The MTA caught 1,500 motorists parked in bus lanes in just ten days since activating cameras on First Avenue’s M15 bus line, the agency said Thursday — as it announced plans to expand the tech city-wide.

The agency started recording drivers from cameras mounted to the front of buses on Oct. 7, thanks to recently-passed state legislation that lifted all restrictions on the technology, which can now be used on any of the city’s 140 miles of bus lanes.

Those caught on First Avenue so far will just be issued warnings thanks to a 60-day grace period. After Dec. 6, fines for those busted will start at $50 and increase by $50 for each additional offense, with $250 being the maximum penalty within a 12-month period.

The cameras are a key piece of the MTA’s multi-pronged effort to revive New York City’s flagging bus system, which has hemorrhaged riders in recent years due to slowest-in-the-nation speeds.

While fixed-location cameras can snap and ticket all cars in bus lanes not making turns, bus-mounted cameras dole out tickets to cars observed parked in lanes either for more than 5 minutes or by two consecutive buses.

By the end of November, bus-mounted cameras will also operate on the B44 on Nostrand Avenue in Brooklyn and the M14 on Manhattan’s 14th Street, officials said.

The MTA’s upcoming 2020 to 2024 capital plan includes $85 million for further expansion.

NYPD officers are also able to ticket bus-lane blockers.

“You can’t have a cop on every corner,” MTA buses and subways boss Andy Byford told reporters Thursday. “This is a smart use of technology.”