Yellow and grey taxis are readily available and can be easily found anywhere in Amman. Taxis for Amman will have a green logo on the driver and passenger doors. The grey ones have an advertisement on top of the car. Resist hailing cabs with another color logo; these cabs are based in other cities and it is illegal for them to pick up fares in Amman. Taxis in Amman are required by law to use meters and most drivers will reset the meter as soon as a fare is picked up. Most trips within Amman should be under JD5. Taxis are not required to use meters after midnight and drivers often expect double the normal fare for late night trips. The base rate for the taxi meter was changed recently from 150 fills (JD 0.150) to 250 fills (JD 0.250) due to the rising oil prices, however, not all taxis have replaced their old meters with new ones, and when a taxi is using an old meter, it is legitimate for the driver to ask you for 10 extra piasters on top of the quoted meter fare. Make sure though that you note the initial fare as soon as the driver turns the meter on in order not to have the driver ask you for "the 10 piasters" when he has a new meter. Drivers are not normally tipped, instead the fare is simply rounded up to the nearest 5 or 10 piasters. It should be noted that many drivers do not carry much change, so exact change should be given when possible. The going rate for a taxi from Amman to the airport is JD35, although some drivers can be talked down to JD30. If you are visiting the Citadel, call it al'Aqal. The driver may try to convince you that the Roman theater is nicer so that he can drop you off there at the bottom of the hill. It's best to be dropped off at the Citadel and walk down the hill to the Roman theater.