MEMPHIS (AP) — U.S. Department of Transportation Secretary Pete Buttigieg traveled to Tennessee on Thursday to learn how the closure of the Interstate 40 bridge connecting that state and Arkansas has affected freight movement since it was shut down more than three weeks ago when a crack was found in the span.

Buttigieg met with regional transportation officials at a FedEx Corp. facility in Memphis before a planned tour of the Hernando De Soto bridge and a news conference later Thursday. Shipping giant FedEx operates its massive fleet of airplanes and trucks out of its headquarters in Memphis, which has seen road traffic problems since the I-40 bridge spanning the Mississippi River was closed and vehicles were diverted to the nearby Interstate 55 bridge.

The visit comes as President Joe Biden pushes for a major, national infrastructure package, while Republican senators want a more modest investment in roads, highways and other traditional public works projects. The cracked bridge has served as a symbol of bridge decay in the U.S., which has 45,000 bridges in poor condition and faces a trillion-dollar backlog in needed repairs, the federal transportation officials have said.

Officials stress that making the bridge safe should be the main goal, with maintaining the steady flow of interstate commerce and commuter traffic as other priorities. Trips across the bridge are averaging as much as an hour, officials said.

"Safety is at the heart of what's happened at the De Soto bridge," Buttigieg during the discussion at FedEx. " I know that that protracted closure has been frustrating, it has been difficult, it has been challenging, and it has been costly."

I-40 is a key artery for U.S. commerce, running from North Carolina to California. Manufacturers, shippers and trucking companies rely on the interstate to move products and materials across the Mississippi River. When the 47-year-old, six-lane I-40 bridge is open, about 50,000 vehicles typically travel across it, with about a quarter of those being commercial trucks, Tennessee transportation officials say.

The I-40 bridge connecting Memphis and the Arkansas city of West Memphis was shut down May 11 after inspectors found a crack in one of two 900-foot (275-meter) horizontal steel beams that are critical for the bridge's structural integrity. Inspectors looking at the four-lane, 71-year-old I-55 bridge have found no problems in the span so far as they assess its long-term ability to handle increased road traffic.

Memphis is a key U.S. infrastructure hub, featuring five major rail lines, an important inland river port, and one of the world's busiest cargo airports.

A timetable for the I-40 bridge's reopening has not been established — officials have said the bridge could be closed for months. Engineers have installed steel plates on each side of the fractured beam and are building a platform to hold heavy equipment necessary for permanent repairs.

The second step of the project, which includes removing and replacing the damaged piece of the beam, is ongoing.

Truck drivers have endured delays on the I-55 bridge, or they have been forced to use two other bridges that cross the river north and south of Memphis. The next nearest Mississippi River crossings are about 60 miles (96 kilometers) to the south near Lula, Mississippi, and 100 miles (160 kilometers) to the north near Dyersburg, Tennessee.

Attending the meeting with Buttigieg at FedEx were U.S. Sen. Marsha Blackburn, a Tennessee Republican, and U.S. Rep. Steve Cohen, a Memphis Democrat. They heard from members of the trucking industry about problems caused by the shutdown.

The bridge closure has made trips longer and more expensive for truckers seeking to get across the river on the three open regional bridges. Trucking companies have changed work times for drivers, while truckers are adjusting their travel routes, sometimes on the fly.

In addition, food warehouses are having trouble servicing restaurants in eastern Arkansas as supplies get delayed, said Jason Higginbotham, chief financial officer of Ozark Motor Lines. Higginbotham said his company was having trouble receiving timely diesel fuel deliveries.

Tennessee Trucking Association president Donna England said the bridge closure is making it more expensive for companies to operate during an ongoing truck driver shortage. The Arkansas Trucking Association has estimated the closure is costing the industry about $2 million a day, said Shannon Newton, the organization's president.

"When that cost is added, then who does that cost get passed down to?" England said during the meeting. "It gets passed down to our consumers, as well as our shippers."

In a letter to Biden days after the bridge's closure, Republican U.S. Sen. Bill Hagerty called for an "urgent, all-hands" approach to the shutdown. Hagerty said the shutdown is "affecting the lives and livelihoods of real people right now."

Arkansas' two Republican senators, Tom Cotton and John Boozman, have said they're concerned about the impact the bridge's closure will have on the economy. The two have said they want an infrastructure package that is more narrowly focused on traditional public works projects like the bridge.

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Andrew DeMillo contributed to this article from Little Rock, Arkansas.