Nairobi’s matatu buses are a festival on wheels : State of the World from NPR In Nairobi, Kenya, tricked-out buses known as, “matatus,” roll through the streets, entertaining both passengers and passers-by. Matatu buses bump with heavy bass over their sound systems, and are painted up with mural montages. It’s a rolling dance club and mobile art gallery in one. In Nairobi, Kenya, tricked-out buses known as, “matatus,” roll through the streets, entertaining both passengers and passers-by.