A depressed grass median, generally 10 metres (33 ft) wide, separates the opposing directions of travel between this point and Peterborough.

[3] The freeway continues along the southern edge of Peterborough and ends at Lansdowne Street to the east of the city.

It was eventually extended to Highway 7 on the east side of Peterborough and later widened to a four-lane expressway in the late 1980s.

In 1953, construction began on a two-lane road northeastward from Highway 35 south of Pontypool, with the purpose of creating a shorter route between Toronto and Peterborough.

That same year, the new Peterborough By-pass opened, providing a route for Highway 7 around the south side of the city via Monaghan Parkway.

The following table lists the major junctions along Highway 115, as noted by the Ministry of Transportation of Ontario.