Update 10:49 p.m.

Interstate 80 westbound is fully reopened between Penfield/111 and DuBois/101. The detour has been lifted.

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Update 7:37 p.m.

The eastbound shoulder and left lane are closed while fire departments are on scene. Lanes will open later tonight.

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Update: 5:47 p.m.

A lane is now open on Interstate 80 westbound between Penfield/111 and DuBois/101.  Traffic will be slow moving, so please use caution. A full opening is expected later tonight.

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Interstate 80 westbound is closed between Exit 111/Penfield and Exit 101/DuBois due to a tractor-trailer fire, according to the Pennsylvania Department of Transportation.  Updates will follow as necessary, though officials will attempt to get one lane open by 7 p.m.