Taxis are an affordable alternative to public transport. A 15-minute journey will only cost about €5. Official Barcelona Taxi's are yellow and black and a green illuminated light on the top of the Taxi indicates that it's available for hire. Licensed Taxis have to charge you the amount displayed on the meter. Tipping for taxis is customary and is about 10% of the full fare. For travel in the very heart of the city, a taxi may not be your best option: most of the centre is pedestrianised and the roads that do go through the centre can be quite narrow and congested. It may be quicker and easer to use the metro system or to walk. For Barcelona radio taxi reservations, call Radio-Taxi 033 on +34 93 303 3033 or ask your hotel Concierge to order a taxi for you.