The Frederick G. Gardiner Expressway, commonly known as the Gardiner Expressway or simply the Gardiner, is a partially at grade and elevated municipal expressway in Toronto, Ontario, Canada. Running close to the shore of Lake Ontario, it extends from the foot of the Don Valley Parkway (DVP) in the east, just past the mouth of the Don River, to the junction of Highway 427 and the Queen Elizabeth Way (QEW) in the west, for a total length of . East of Dufferin Street to just east of the Don River, the roadway is elevated for a length of , unofficially making it the longest bridge in Ontario. It runs above Lake Shore Boulevard east of Spadina Avenue. The highway is named after the first chair of the now-defunct Metro Council, Frederick G. Gardiner. The six-lane section east of the Humber River was built in segments from 1955 until 1964 by the Metropolitan Toronto government with provincial highway funds. The ten-lane section west of the Humber was formerly part of the QEW. The Gardiner Expressway is wholly owned and operated by the City of Toronto. The highway has been described as "an out-of-date, crumbling and frequently traffic-jammed freeway". Particularly for the elevated section whose condition has deteriorated over the years, extensive repairs were carried out in the mid-1990s, coinciding with significant commercial and residential development in the vicinity. Due to its limited capacity and high maintenance, the Gardiner has been the subject of several proposals to demolish it or move it underground as part of downtown waterfront revitalization efforts. The section east of the Don River was demolished in 2001, while in 2018 the offramp to York/Bay/Yonge Streets was replaced by an offramp to Lower Simcoe Street, and the segment east of Jarvis Street to the Don River is to be realigned as of August 31, 2021. Route description From the Queen Elizabeth Way (QEW) and Highway 427 interchange, east to the Humber River, the Gardiner is straight, eight-to-ten lanes wide. Due to its status as a former Ontario 400-series highway when it was previously the eastern segment of the QEW, and because of its more recent design (rebuilt in the late 1960s), this section was built to higher standards than the Metro-constructed Gardiner. A system of collector and express lanes serves the Parclo interchanges with Kipling Avenue and Islington Avenue and this segment has a speed limit of 100 km/h