Uber is using an unusual resource to protest a New York City proposal: its own cars.

Protesters attending an Uber rally outside New York’s City Hall on Tuesday can get free rides to and from the event through the company’s carpooling service.

The company is organizing a protest against legislation backed by Mayor Bill de Blasio that would limit how much large car services in the city could grow each year in order to limit congestion on city streets.

Uber says the bill “would stop thousands of new drivers from joining the Uber platform … destroy 10,000 job opportunities for New Yorkers in just one year, and result in longer wait times, higher prices and less reliable service for riders.”

Uber says anyone who takes a cab to or from City Hall on Tuesday between 10:30 a.m. and 2:30 p.m. will get a free ride through uberPOOL—though theoretically that means some City Hall employees could get swept up in the mix alongside protesters.

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