considerably. A right of way was also acquired to bridge the gap in Eglinton. Until the mid-1950s, Eglinton did not cross either of the valleys of the Don River. The road ended at Brentcliffe Road (unassigned path beyond Laird towards Brentcliffe and the dump was once site of hangar for Leaside Aerodrome) and resumed at Victoria Park Avenue (then known as Dawes Road). This break resulted in a bypassed eastern stub at Bermondsey Road signed as Old Eglinton Avenue. The Department of Highways relinquished control of Highway 109 to the newly formed Metro government. Metro built the new section of Eglinton Avenue, first between Dawes Road and Don Mills Road in 1955, and later between Don Mills Road and Leaside in 1956. In the west, the street ended at the Humber River until 1970. On the opposite side in Etobicoke, the Richview Sideroad followed the same alignment as far as the Metro Toronto–Peel boundary. That year, the river was bridged to connect the Richview Sideroad segment as an extension of Eglinton. At about the same time, when the Highways 401 and 427 interchange was reconstructed, the street was connected to Lower Base Line, extending the street even further west into Mississauga. West of Mississauga, in Halton Region, it is a rural road and is still named Lower Base Line (the corresponding Upper Base Line being present-day Steeles Avenue). The structure over the GO rail line and East Don River is known as the Harvey C. Rose Bridge, and honours the chief engineer of the Toronto and York Roads Commission, later the Metropolitan Toronto Commission of Roads. Richview Expressway proposal In 1943, city planner Norman Wilson indicated the possible future need for a new urban highway to connect Eglinton Avenue with the Richview Sideroad. These plans would mature into the Richview Expressway with the formation of Metropolitan Toronto in 1954. Part of the requirements for the Richview Expressway was a staged construction of a parallel arterial road. This was approved in 1963, and construction began on Eglinton Avenue from west of Weston Road to Royal York Road. With its completion in 1970, the four-lane Richview Sideroad was renamed Eglinton Avenue West. In Toronto, the right-of-way to construct the Richview Expressway remains but the project has never come to fruition, save for high-speed ramps from Eglinton to Highways 401 and 427 at the complicated interchange near Renforth station. Local opposition has made