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Associated Press

It's likely that single drivers in nearly every big city in the world have at one time looked enviously at HOV (high-occupancy vehicle) lanes that allow cars with multiple drivers to zip past them during rush hour. But what happens to traffic congestion and travel times if you just abolish them? If the experience in Jakarta, Indonesia, is an indication, it's a huge mess, a new study finds.

Jakarta was, until recently, one of the most extreme examples of restrictive HOV policies anywhere in the world – made even more prominent by the fact that the city supports an immense population of 30 million. When Jakarta abruptly cancelled their HOV lanes that required three drivers per car, researchers were able to immediately see the aftermath. It wasn't pretty.

What they found: Ending the HOV advantages on major streets in Jakarta put so many additional cars on the road that it increased travel times for everyone by 87% during the evening rush hour, and by 46% during morning rush hour.

"Remarkably, lifting the HOV policy not only caused dramatic increases in travel time along the previously designated HOV roads, but along the parallel roads as well," the Harvard and MIT researchers wrote in Science.

What it means: If HOV lanes were dropped in cities like New York, Sao Paulo or Rio de Janeiro – where the commute times are already incredibly long - it could double the evening commute from an hour and a half to three hours.

Go deeper

Updated 26 mins ago - World

Fatal stabbing of British MP David Amess declared a terrorist incident

Police outside Belfairs Methodist Church in Leigh-on-Sea, England, on Oct. 15. Photo: John Keeble/Getty Images

Authorities have declared the death of David Amess a terrorist incident, hours after the Conservative Party lawmaker in the U.K. was fatally stabbed while meeting with local constituents in a church in eastern England on Friday.

The big picture: The Metropolitan Police has found "a potential motivation linked to Islamist extremism."

Biden: DOJ should prosecute those who defy Jan. 6 subpoenas

President Biden speaks with reporters at Bradley International Airport in Windsor Locks, Connecticut. Photo: Brendan Smialowski/AFP via Getty Images

President Biden said Friday that the Justice Department should prosecute those who defy subpoenas from the Jan. 6 select committee.

Why it matters: The president's remarks come one day after Donald Trump ally Steve Bannon failed to show up for a deposition before the committee.

Updated 2 hours ago - Politics & Policy

Bill Clinton hospitalized for non-COVID-related infection

Former President Bill Clinton. Photo: Win McNamee/Pool/AFP via Getty Images

Former President Bill Clinton was admitted to the University of California, Irvine Medical Center on Tuesday for a non-COVID-related infection, his spokesperson Angel Ureña said Thursday.

The latest: In an update on Friday, Ureña said Clinton's health indicators are "trending in the right direction, including his white blood count which has decreased significantly."