From the, ahem, article:

“The time savings was a lot on the front end,” she said, when the agency
and the contractor designed a bridge with “the material that was
available.” She added that Fern Hollow has “a higher factor of safety,”
than it strictly needs; in order to keep the process moving as quickly
as possible, they designed and built with “some conservative engineering
guesses … so we wouldn't have to go back.”

The speed of Fern Hollow’s restoration can not — and will not — become
PennDOT’s new normal, Moon-Sirianni stressed. It was an emergency.

“There’s a lot of folks that work very, very quickly when something is
an emergency,” she said, reeling off as examples PennDOT’s central
office, PennDOT’s bridge specialist and the Federal Highway
Administration. “You can only have so many emergencies.”