I do understand why they did it that way because it’s probably inexpensive for them,” a rider said. “It’s just adding a small piece instead of changing the entire design.”

The MTA is trying something new to deter fare evaders just weeks after installing spikes on some subway turnstiles.

The MTA is trying to get a leg up on turnstile jumpers at the Brooklyn Bridge-City Hall/Chambers Street subway station. Crescent-shaped metal shields attached Tuesday to a bank of turnstiles at the Lower Manhattan complex are the MTA’s latest attempt to curb a fare-evasion crisis that last year cost the transit agency an estimated $360