Travel on Interstate 79 in Butler County is going to get more complicated starting on Saturday.
Starting then, northbound traffic will be shifted to the southbound side of the highway, with single-lane traffic in both directions, at a bridge replacement project at the Route 422 interchange, Exit 99 in Muddycreek.
Delays are likely from 7 a.m. to 3 p.m. Saturday while crews make the transition.
The two-year, $14 million project will replace both bridges. Next season, southbound traffic will be crossed to the northbound side. About 25,000 vehicles use that section of highway on a typical day.
Also on Saturday, the ramp from eastbound Route 422 to northbound I-79 will close at about 7 a.m. and remain closed through late July.