How does an N.J. driver get a discount on Staten Island bridges?

NJ.com: "Generally, you would be out of luck if you're using a New York MTA run bridge, such as the Verrazano Bridge, to and from Staten Island. But the Outerbridge is run by the Port Authority of New York and New Jersey, which offers a commuter discount for its Staten Island crossings, which include the Outerbridge Crossing, the Goethals Bridge and the Bayonne Bridge. GOT QUESTIONS? Ticked off about mass transit? Wondering about road construction? E-mail your questions to NJ.com's transportation expert Larry Higgs. He'll answer your questions on Tuesdays and Thursdays on NJ.com. You can also Tweet @CommutingLarr are in luck. Drivers who sign up for the agency's Staten Island bridges plan get a 50 percent discount off the E-Z-Pass rate of $12.50 which comes to $6.25 per trip. Drivers have to make a minimum of three Staten Island-bound trips a month to qualify for the plan."