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ATLANTA — Atlanta’s dreadful rush-hour traffic could be extra nasty for months to come after a raging fire underneath Interstate 85 collapsed an elevated portion of the highway and shut down the heavily traveled route through the heart of the city.

Traffic was bumper to bumper on nearby streets as drivers were forced to take a detour Friday, the morning after the blaze caused the concrete to crumble.

The collapse took place a few miles north of downtown, and the effects could fall most heavily on commuters from Atlanta’s densely populated northern suburbs. They will have to find other routes to work or ride mass transit.

Connie Bailey-Blake, of Dacula, 37 miles northeast of Atlanta, waited for a MARTA commuter train to reach her job downtown. She typically drives, often by way of the interstate.

“I’m supposed to be at work at 9 a.m. and it’s 9:15 a.m.,” Bailey-Blake said. “The first few days are going to be difficult. This will be my new life.”

Amelia Ford picked a new route to work by car and said it took her 45 minutes to travel 3 miles from her Atlanta home to the nearest open on-ramp to the interstate.

Georgia Transportation Commissioner Russell McMurry said 350 feet of highway will need to be replaced in both directions on I-85, which carries about 400,000 cars a day through the city and is one of the South’s most important north-south routes.

He said repairs will take months but declined to be more specific.

The collapse effectively “puts a cork in the bottle,” Georgia State Patrol Commissioner Mark McDonough said.

The fire broke out Thursday afternoon in an area used to store state-owned construction materials and equipment, sending flames and smoke high into the air. Fire authorities said they had not determined how the blaze started.

McMurry said his department stored coils of plastic conduit used in fiber optic networks beneath the span but insisted they were noncombustible.

No injuries were reported. Firefighters shut down the section of highway before it gave way, and made it to safety themselves after hearing the road cracking and seeing concrete go flying, authorities said.

In the meantime, MARTA increased rail service and said additional staff will be on hand to help passengers figure out how to get where they’re going.

U.S. Transportation Secretary Elaine Chao promptly released $10 million for the initial repair work, and the Federal Highway Administration promised more in emergency repair funds. Officials gave no estimate of how much the job would cost.

Lauren Stewart, director of the Structural Engineering and Materials Laboratory at Georgia Tech in Atlanta, said intense heat can compromise even steel-reinforced concrete.

“With fires, especially fires that burn for long periods and with high heat, you can see structures, anything from buildings to bridges, can have their material properties degrade,” Stewart said.

It’s happened before. In 1996, a fire in a big pile of tires beneath I-95 in Philadelphia left a span too weak to handle cars, forcing authorities to shut down 4 miles of the busy East Coast route for repairs.

Andy Herrmann, a retired partner with the New York-based engineering firm Hardesty & Hanover, said there have also been a few instances of gasoline trucks crashing and causing intense heat that damaged overpasses.

Herrmann said concrete will undergo severe cracking at about 1,500 degrees Fahrenheit and start disintegrating at higher temperatures. Building roads to withstand such heat would be prohibitively expensive, he said.

“We have limited dollars for maintaining our bridges,” Herrmann said. “This is such a rare thing to occur.”

Traffic is bumper to bumper as people scrambled to find alternate routes on Friday, March 31, 2017. Many commuters in some of Atlanta’s densely populated northern suburbs will have to find alternate routes or ride public transit for the foreseeable future after a massive fire caused a bridge on Interstate 85 to collapse Thursday, completely shutting down the heavily traveled highway. (AP Photo/Alex Sanz)
https://www.timesleader.com/wp-content/uploads/2017/03/web1_115830930-4bc8ce2607ce413eaa240ba568a9e902.jpg.optimal.jpgTraffic is bumper to bumper as people scrambled to find alternate routes on Friday, March 31, 2017. Many commuters in some of Atlanta’s densely populated northern suburbs will have to find alternate routes or ride public transit for the foreseeable future after a massive fire caused a bridge on Interstate 85 to collapse Thursday, completely shutting down the heavily traveled highway. (AP Photo/Alex Sanz)

Pedestrians try to cross detoured traffic as Piedmont Avenue is closed due to a section of an overpass that collapsed from a large fire on Interstate 85 in Atlanta, Friday, March 31, 2017. Atlanta’s dreadful rush-hour traffic got even worse Friday, the morning after a raging fire underneath Interstate 85 collapsed an elevated portion of the highway and shut down the heavily traveled route through the heart of the city. (AP Photo/David Goldman)
https://www.timesleader.com/wp-content/uploads/2017/03/web1_115830930-53c819cd540c4054bc063a7c09399393.jpg.optimal.jpgPedestrians try to cross detoured traffic as Piedmont Avenue is closed due to a section of an overpass that collapsed from a large fire on Interstate 85 in Atlanta, Friday, March 31, 2017. Atlanta’s dreadful rush-hour traffic got even worse Friday, the morning after a raging fire underneath Interstate 85 collapsed an elevated portion of the highway and shut down the heavily traveled route through the heart of the city. (AP Photo/David Goldman)

Construction crews work on a section of an overpass that collapsed from a large fire on Interstate 85 as the Midtown skyline stands in the background in Atlanta, Friday, March 31, 2017. Atlanta’s dreadful rush-hour traffic got even worse Friday, the morning after a raging fire underneath Interstate 85 collapsed an elevated portion of the highway and shut down the heavily traveled route through the heart of the city. (AP Photo/David Goldman)
https://www.timesleader.com/wp-content/uploads/2017/03/web1_115830930-159030e7eeb54b8183734ecfeb773c16.jpg.optimal.jpgConstruction crews work on a section of an overpass that collapsed from a large fire on Interstate 85 as the Midtown skyline stands in the background in Atlanta, Friday, March 31, 2017. Atlanta’s dreadful rush-hour traffic got even worse Friday, the morning after a raging fire underneath Interstate 85 collapsed an elevated portion of the highway and shut down the heavily traveled route through the heart of the city. (AP Photo/David Goldman)

Construction crews work on a section of an overpass that collapsed from a large fire on Interstate 85 in Atlanta, Friday, March 31, 2017. Atlanta’s dreadful rush-hour traffic got even worse Friday, the morning after a raging fire underneath Interstate 85 collapsed an elevated portion of the highway and shut down the heavily traveled route through the heart of the city. (AP Photo/David Goldman)
https://www.timesleader.com/wp-content/uploads/2017/03/web1_115830930-c76888fe105c46879ccbc46faac5d56f.jpg.optimal.jpgConstruction crews work on a section of an overpass that collapsed from a large fire on Interstate 85 in Atlanta, Friday, March 31, 2017. Atlanta’s dreadful rush-hour traffic got even worse Friday, the morning after a raging fire underneath Interstate 85 collapsed an elevated portion of the highway and shut down the heavily traveled route through the heart of the city. (AP Photo/David Goldman)

Crews work on a section of an overpass that collapsed from a large fire on Interstate 85 in Atlanta, Friday, March 31, 2017. Many commuters in some of Atlanta’s densely populated northern suburbs will have to find alternate routes or ride public transit for the foreseeable future after a massive fire caused a bridge on Interstate 85 to collapse Thursday, completely shutting down the heavily traveled highway. (AP Photo/David Goldman)
https://www.timesleader.com/wp-content/uploads/2017/03/web1_115830930-dfa39ab1fdf64b29b01545c82d4513cc.jpg.optimal.jpgCrews work on a section of an overpass that collapsed from a large fire on Interstate 85 in Atlanta, Friday, March 31, 2017. Many commuters in some of Atlanta’s densely populated northern suburbs will have to find alternate routes or ride public transit for the foreseeable future after a massive fire caused a bridge on Interstate 85 to collapse Thursday, completely shutting down the heavily traveled highway. (AP Photo/David Goldman)

In this aerial image made from a video provided by WSB-TV, a large fire that caused an overpass on Interstate 85 to collapse burns in Atlanta on Thursday. Witnesses say troopers were telling cars to turn around on the bridge because they were concerned about its integrity. Minutes later, the bridge collapsed.
https://www.timesleader.com/wp-content/uploads/2017/03/web1_115830930-fcb9abd104074ac1b90dab833f40558a.jpg.optimal.jpgIn this aerial image made from a video provided by WSB-TV, a large fire that caused an overpass on Interstate 85 to collapse burns in Atlanta on Thursday. Witnesses say troopers were telling cars to turn around on the bridge because they were concerned about its integrity. Minutes later, the bridge collapsed. WSB-TV via AP

By Kate Brumback and Bill Barrow

Associated Press