The tone the turnstile makes when it successfully reads the card, and fails to r... | Hacker News

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		cmurf on Aug 29, 2015 \| parent \| context \| favorite \| on: New York City's MTA Exposed (2005) [pdf] The tone the turnstile makes when it successfully reads the card, and fails to read the card, are the same. Don't be blind!

fennecfoxen on Aug 29, 2015 | [–]

The tone lasts for infetesimally longer when it fails to read the card. Good luck telling the difference, even if you're blind.

thedufer on Aug 29, 2015 | [–]

That's what I thought when I first moved here, but there is actually a difference. It is very subtle.

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