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.

Abandoning the policy will be bad news for the poor in a city where maddening traffic produces numerous novel ways to eke out a living. Apart from jockeys, there are self-appointed U-turn police and parking wardens who are tipped by drivers despite sometimes hindering more than helping.

"I want the authorities to extend the 3-in-1," said Muhammad Asmin, a 27-year-old who dropped out of school to become a jockey more than a decade ago to earn money for his family. "It is good for us, the poor, even if it's not working," said Asmin, who earns up to $15 a day by hopping in and out of cars.

Jakarta is the world's most congested city, according to a study of how often vehicles brake during a commute. Officials estimate Jakarta's traffic jams cause economic losses of about $3 billion a year.

The 3-in-1 rule was introduced in 2003 and the jockeys appeared soon after. Since then, the traffic has only gotten worse, mainly because more Indonesians can afford cars, which has overwhelmed a road network that has hardly grown. The car-pooling policy has a particularly bad image since it's widely regarded as ineffective and also involves children, who take huge risks by getting into the vehicles of strangers.

"We have been blamed for worsening the gridlock but the government didn't provide sufficient jobs for us," said Alfa Wahyudi, a 21-year-old who came to Jakarta from Borneo six months ago. "Don't blame our presence if the government is unable to provide us jobs."

The convenience of traveling on a 3-in-1 road is such that some drivers have arrangements with two or three regular jockeys.

Repeated crackdowns on the jockeys, who quickly scatter into side streets at the sight of police, failed to wipe out the profession. If caught, they are taken to a detention center for a couple of weeks and asked to sign a letter promising not to work as a jockey again. But many say they return to the roadside as soon as they can.

Wulandri, who was twice caught and sent to a detention center, said it was no deterrent compared with the $10 she could easily make in a day.

As the mother of a one-year old boy, she was popular with drivers because it meant they could get two passengers for the price of one.

"I purposely brought my child because usually a single driver does not have to pay for two jockeys and they are often sorry for the woman who was carrying a baby," said Wulandari, who goes by one name.

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