1. An arrangement in a taximeter for switching on a selected one of n tariff levels having different parameters, n being an integer, said parameters including a base level and factors for determining an appropriate fare, said taximeter comprising keys for respectively incrementing and decrementing through said n tariff levels by repeated actuations of said respective keys, means for determining an appropriate fare using the factors of a selected tariff level, and display means for displaying assignment characteristics designating a selected tariff level, the parameters associated with the selected tariff level, and additional parameters, wherein said arrangement comprises: timer means for counting a predetermined waiting time upon actuation of one of said keys; and means responsive to said timer means, for preventing said display means for displaying the parameters of a selected tariff level until said waiting time has been counted.