PennDOT announced Thursday morning that it has temporarily reduced the speed limit portions of various interstates in the northwest region of the state.

Speeds are reduced to 45 mph on Interstate 79 from the Interstate 80 interchange in Mercer County to Exit 105 (Route 108, Slippery Rock) in Butler County; as well as Interstate 376 from the Interstate 80 interchange to Exit 13A (Route 224, Poland) in Lawrence County.

In addition, Tier One vehicle restrictions have been placed on I-80 from the Ohio State line in Mercer County to Exit 161 (Route 220, Bellefonte) in Centre County, as well as I-376 from the I-80 interchange in Mercer County to the ending point in Allegheny County.

On roadways with speed restrictions, commercial vehicles must move to the right lane.