Twelve people reportedly died between between July 3 and July 5 during a traffic jam backed up for more than 13 miles in Brebes on the island of Java in Indonesia.
The massive jam occurred on a single traffic junction that includes construction, toll gates and hot temperatures.
The traffic jam took place on a major highway nicknamed "Brexit," which is short for "Brebes exit," reports AFP.
Thousands of cars began piling up three days before Eid al-Fitr, an Islamic holiday at the end of Ramadan.
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"In terms of this Brexit case, there's been a total of 12 victims over different days," transport ministry spokesman Hemi Pramuraharjo said.
According to Pramuraharjo, some who died were older, while others passed away from fatigue and other health problems. An unidentified 1-year-old reportedly died from fumes.
Pramuraharjo said more than 400 people died during road trips over the holiday, including the traffic jam, which was made worse by vendors on the roadside hawking goods and crowded markets near the intersection.
"There is a bottleneck there, where there's a petrol station very nearby and many people queue," Pramuraharjo stated. "There's no space on the road. We don't have a solution."
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Some drivers said the long lines for the toll gates made the situation worse, notes the Daily Mirror.
It's unclear why officials won't open the toll gates to allow people to drive through without paying to save human lives.
A 14-year-old boy allegedly died from carbon dioxide poisoning after the vehicle he was traveling in was stuck for more than six hours.
A 36-year-old man fainted as he exited a bus, who was later pronounced dead at a hospital.
A motorcycle ambulance was reportedly unable to reach dying travelers because of the traffic jam.
According to Sri Gunadi Partook, Brebes' chief medical officer, 18 people have died on this road over the past week.
Officials set up a hotline for people to call in case of an emergency, but it's unclear how help could reach them, notes the BBC News.