Lines of people from women holding babies to school age children, with a hand held up to show they're for hire, are a ubiquitous sight on the Indonesian capital's busiest roads during rush hour.

But not this week. Traffic-clogged Jakarta plans to suspend its peak-time rule of three people to one car from Tuesday. And the passengers for hire, known as jockeys, who helped drivers cheat the traffic controls, will be out of a job.

By lifting the 3-in-1 rule, city authorities will be testing what happens to congestion. If there's no difference to the number of cars on the road, they'll know that a system in place for more than a decade is broken.