Vacant taxis on the move in Amsterdam are often on call to their dispatcher. Occasionally, if you get lucky, they'll stop for you if you hail them, but the regular practice is to wait by a taxi stand or telephone for a taxi. Taxi stands are at the major squares and in front of the large hotels. You can also call Taxicentrale Amsterdam (TCA), the main dispatching office. A 5-km (3-mile) ride will cost about €20. An interesting alternative in the city is the WielerTaxi (bike taxi), which resembles a larger version of a child's pedal car (it's not very practical in the rain).
Taxicentrale Amsterdam. 020/777–7777; www.tcataxi.nl.