Updated Aug. 17 at 11:05 a.m.
All lanes have been reopened, according to @511ONNortheast.
The lane and southbound shoulder are blocked after an incident on Highway 537 in Wanup at Old Wanup Road, according to a tweet from the MTO site @511ONNortheast.
The tweet was issued shortly after 9 a.m. Monday, and did not elaborate on the nature of this incident.
The site urged people to use caution in the area.