The aural offenses of the New York City subway are legion. Trains screech. Announcements drone on. Panhandlers’ performances lurch off key.

But for nearly a decade, a singular squawk has bedeviled riders with particular insistence: the emergency exit siren, publicly shaming — or perhaps celebrating — travelers who did not care to wade into common turnstile traffic.

Now it will blare no more. In an acknowledgment that the alarms had done little to discourage fare evasion as intended, the Metropolitan Transportation Authority said on Wednesday that it was disabling them at all of its stations.

“We gave it a shot,” said Kevin Ortiz, a spokesman for the authority, which had already removed alarms from sites with station agents.