Here is how you ride the bus in Sudan:

There are two types of busses, large and small. The large busses are slower, stop frequently and cost 50 Dinar (25 cents). The small busses are faster, stop less frequently and cost 100 Dinar (50 cents). There are two people who work on the bus, the Driver and the Money Collector. Soon after the bus leaves, the Money Collector snaps his fingers; this means it's time to pay. Everyone sends their money forward and waits for change. When you want to stop, you snap at the Money Collector and he, in turn, hisses at the driver. After you get off, the Money Collector will again hiss at the driver, signaling him to go.