Crews have begun replacing the deck of Pittsburgh's Liberty Bridge, one of the busiest arteries crossing the Monongahela River and leading to the city's southern suburbs.
PennDOT says crews will replace the deck one lane at a time in four phases over roughly 160 days.
That will enable crews to keep at least one inbound and one outbound lane open at all times. The available lanes will shift throughout the day, according to the flow of traffic in and out of the city, especially during rush hours.
The project will cost about $80 million.