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.
Like atappers and ojeks, it was one method Indonesians have become accustomed to in their daily commuting struggle.
A car jockey solicits by the side of the road a random commuter who does not have enough passengers to use a carpool lane legally.
[1][2] It also offers the poor a way of making money without formal work.
[5][6] On August 30, 2016, after a successful trial, an odd–even rationing (ganjil-genap) system began to replace the "three in one" rule.