Cagliari's taxis are safe and generally reliable. Cheating is rare. Just make sure that the meter is running before you set off. The starting rate is €3 (€5 on Sundays and public holidays, €5.50 between 22:00 and 06:00) with a per kilometre rate of €0.90, which goes up to €1.30 at night time or when driving out of town. Few taxi drivers speak English, so it's a good idea to write down the address, or to call someone who can explain.