ABU DHABI, United Arab Emirates (CNN) -- Six people were killed, at least 40 were injured and dozens of vehicles burned Tuesday when hundreds of cars collided on a fog-shrouded Persian Gulf highway.
Media in the United Arab Emirates reported four separate accidents, the largest involving more than 200 cars, on the highway connecting the cities of Dubai and Abu Dhabi on Tuesday.
The biggest wreck began in the early morning near Ghantoot, about seven kilometers (4.5 miles) from Dubai. At least 25 cars burned among the 200 that piled up as the fog and high speeds made for a deadly mixture, police said.
The scope of the accident and limited visibility delayed rescue efforts until around noon, media reports said, when helicopters began taking the injured to hospitals.
The accident resulted in a 20-kilometer (12-mile) traffic jam that lasted for several hours.
Smaller accidents accounted for up to 100 damaged vehicles, according to media reports.
Traffic accidents are a leading cause of death in the United Arab Emirates because drivers often travel at high speeds, according to the U.S. State Department.
"Unsafe driving practices are common, especially on intercity highways," the State Department says on its travel Web site. E-mail to a friend
CNN's Abdel Halim Huzayen contributed to this report.