A zémidjan is a type of taxi

Taxicab

A taxicab, also taxi or cab, is a type of vehicle for hire with a driver, used by a single passenger or small group of passengers, often for a non-shared ride. A taxicab conveys passengers between locations of their choice...

 found in Benin

Benin

Benin , officially the Republic of Benin, is a country in West Africa. It borders Togo to the west, Nigeria to the east and Burkina Faso and Niger to the north. Its small southern coastline on the Bight of Benin is where a majority of the population is located...

. The highest concentration is found in the largest city, Cotonou

Cotonou

-Demographics:*1979: 320,348 *1992: 536,827 *2002: 665,100 *2005: 690,584 The main languages spoken in Cotonou include the Fon language, Aja language, Yoruba language and French.-Transport:...

, where there are an estimated 72,000. Zémidjans are motorcycles that carry one to two passengers for short distances within towns. The fares are entirely negotiable. The drivers wear uniforms that are color-coded by city, and have registration numbers written on the back. The name derives from the Fon language

Fon language

Fon is part of the Gbe language cluster and belongs to the Volta–Niger branch of the Niger–Congo languages. Fon is spoken mainly in Benin by approximately 1.7 million speakers, by the Fon people...

where zémidjan means "get me there fast" or "take me quickly".
The way to actually call a zémidjan is "Kekenon", deriving also from Fon language and means "the man that carries". Usually the zémidjan stops by and then you start discussing the price depending on where you are going. The minimum rate is 100FCFA.