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King's Highway 420 is a 400-series highway in the Canadian province of Ontario that connects the Queen Elizabeth Way with downtown Niagara Falls. The roadway continues east as the limited-access expressway Niagara Regional Road 420, which was transferred to the jurisdiction of the Regional Municipality of Niagara in 1998; it connects with the Rainbow Bridge at the border with the United States over the w:Niagara River. King's Highway 420 has a speed limit of 80 kilometers per hour (50 mph), making it the only 400-series highway to have a speed limit less than 100 kilometers per hour (62 mph) for its entirety. Originally constructed as a divided four-lane road with two traffic circles, the route of Highway 420 formed part of the QEW between 1941 and 1972. It was assigned a unique route number during its reconstruction as a freeway and the construction of the large interchange at its western terminus at Montrose Road. (Full article...)