Wikipedia:Today's featured list/June 30, 2017
The 400-series highways are a network of controlled-access highways throughout the southern portion of the Canadian province of Ontario, forming a special subset of the provincial highway system. They are analogous to the Interstate Highway System in the United States or the Autoroute system of neighbouring Quebec, but under provincial jurisdiction and regulated by the Ministry of Transportation of Ontario (MTO). Although Ontario had been constructing divided highways for two decades prior, 400-series designations were introduced in 1952. Initially only Highways 400, 401 and 402 were numbered; other designations followed in the subsequent decades. Modern 400-series highways have high design standards, speed limits of 100 kilometres per hour (62 mph), and various collision avoidance and traffic management systems. The design of 400-series highways has set the precedent for a number of innovations used throughout North America, including the parclo interchange and a modified Jersey barrier design known as the Ontario Tall Wall. (Full list...)