A car jockey, also known as a traffic jockey and known in Indonesian as joki three-in-one (referring to the "three in one" rule, the term used for the high-occupancy vehicle rule), was someone in Indonesia who had resorted to informal employment to bypass the gridlock that grips Indonesia's largest cities, especially Greater Jakarta. They were paid by drivers to ride on vehicles so that those vehicles would be qualified to use high-occupancy vehicle lanes. Like atappers and ojeks, it was one method Indonesians have become accustomed to in their daily commuting struggle.