While on my visit to Haiti the two transportation systems I used the most were the Tap-tap buses and the motor bikes. The Tap-tap didn't require any negotiations with the driver. The prices are all set. The motorbikes however, required some negotiating to get to your destination. The motor bikes are the fastest means of transportation because they can move through traffic quickly.
Tap-Tap buses
The Haitian Tap- tap buses are usually around $15GUD. These Tap-tap buses are the modern day taxi services that take you anywhere. They are located in several locations throughout cities such as Petionville and Port-au-Prince. All the Tap-taps have specified routes that they take. When passengers hop on the Tap-tap buses, everyone on the Tap-tap greets the newcomer by saying "bonjour," " bonsoir," or "bon nuit," depending on the time of day. When you want to get off at your stop, you hit the glass behind the driver so the driver knows to stop. If you are sitting at the end of the Tap-tap bus, any one of the passengers will hit the glass for you and the driver will stop. Once you get off at your stop, you pay the driver.
Motorbikes
Motorbikes or “moto” are other means of transportation in Haiti. They are more expensive than the Tap-tap, but they get you to your destination quicker. Motorbikes are found in the same areas as Tap-tap buses. The motorbike drivers travel in packs. They all know each other. Its a form of safety. All the prices can be negotiated Locals usually use the same person for traveling on motorbikes because the locals want to build a relationship and set a firm price. It's always good to go with the same motorbike driver in case an emergency situation.