From the NYT Jakarta Journal – Finding a Detour to Earn a Living in Indonesian Traffic Jams
JAKARTA, Indonesia — When this city of epic traffic jams started carpooling a while back, it inadvertently gave birth to an entirely new profession: jockey.

For less than a dollar, car owners hire one or two jockeys to gain access to stretches of the city’s “3 in 1,” high-occupancy lanes. The jockey is essentially an extra passenger who helps commuters circumvent carpooling rules, making the ride into central Jakarta slightly less slow. …

The difference between this and casual carpooling/instant carpooling/slugging is that here the passengers get paid (and may otherwise not travel … though that is not clear if the jockey is a full-time or just a side job).