Metro Turnstyles
04/24/23
“How do metro systems control who is getting in and out?”
Metro systems often rely on fare collections to keep financial operations stable. This presents the need to ensure people who enter the paid area. Actually paid. This is often done through Metro Turnstiles, which uses a gatekeeping mechanism to only let people in who pay. Payments can be accomplished through card, biometrics, coin, paper currency, pass, and many other means.
Isaac's science blog 