Though the disputes--most commonly customers arguing with collectors about change-- occur about once a week, Olga Krueger, the supervisor of bridge operations, says she hasn't seen a robbery during her six-year tenure.

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Testing for cashless operations at the bridge will continue through the spring and summer.

WSJ: Henry Hudson Bridge to Lose Cash Tolls

During flight operations the captain can normally be found on the bridge directly involved in the mechanics of positioning and preparing the ship for launch and recovery of aircraft, ensuring the safe navigation of the ship and overseeing flight deck operations.

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MSPs had earlier been told by Steve Walker, operations director with Stagecoach, that a "wider problem" for bus firms would be getting to the bridge from both sides of the Firth.

BBC: New bridge 'not worth the cost'