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The buses have a bar system. As you walk into the bus, there will be two short bars that record the number of people who have entered. You shouldn’t stand between the bars too long because you might have to pay the toll over again and the driver doesn’t appreciate it. Try to bring exact change for the bus toll and in coins. Have your money ready to hand to the drive as they like the process as fast as possible. Pay as you enter and try to not use bills.