ontario highway pronounced seven known colloquially series highway canadian province ontario connects queen york regional road highway arterial extension known york regional road continues metres north boulevard ontario second busiest freeway volume busiest north_america interstate california like portion route divided collector express system fourteen continuous lanes notable highway multi level interchanges junctions largest interchanges ontario constructed interchanges highway highway recent completed respectively main north south traffic comes highway eastbound expressway makes use freeway airport access serves western portion toronto northeastern portion southeastern portion western portion section street heavily traversed transit corridor transit operate express buses section highway designated follows originally lane roadway known highway short freeway north known airport expressway routes upgraded 1950s 1960s eventually present configuration freeway extended north pearson airport highway following years short arterial extension later built section designated york regional road plans announced extend highway north major funding beginning timeline provided route description second busiest freeway canada average vehicles use day section road road annual average daily traffic aadt count route long southern terminus route begins highway plaza located east route parking lot provides access highway grade access length route lane road splits divided highway descends evans avenue highway complicated interchange providing northbound access evans avenue expressway southbound access expressway evans avenue north interchange lanes form collector lanes collector express system ramps pass southbound lanes converge form express lanes collector express system serves divide local traffic freeway freeway traffic express lanes provide access expressway collector lanes provide local access interchanges crossing tracks freeway interchanges street set crossing ramps provide access collector express lanes north referred highway passes beneath street west provide direct access instead provides ramps parallel arterial roads run parallel freeway evans avenue road interchange provided shortly southwest college provides access southbound lanes holiday drive following north partial interchange road provides access northbound lanes southbound lanes transfers provide second final opportunity cross express collector lanes vice versa south complicated square kilometre highway interchange final set ramps collector express system provides access southbound lanes drive collectors express lanes cross southbound collectors collector lanes provide access avenue transition highway express lanes interchange continues route highway north highway express lanes ramps highway constructed memorial cemetery highway passes interchange displaced approximately west despite size ramps provide access southbound eastbound vice versa connection handled highway highway crosses drive curves east runway pearson airport shortly crosses interchanges road airport road forms line ramps point provide access pearson airport freeway narrows lanes avenue freeway follows boundary line toronto encounters multi level junction length provides access airport southbound eastbound movement performed interchange south highway continues straight north narrows lanes crossing line passes west beneath boulevard morning star drive avenue west interchange route freeway bends slightly eastward toronto boundary crosses drains approaching fourth final interchange crosses avenue enters passes beneath highway crosses undeveloped area terminating final interchange highway mainline continues north lane arterial road designated york regional road history highway officially designated sections freeway place prior date designation applied following completion interchanges expansion section collector express system highway designated lane road travelling north highway lake shore boulevard toronto grew following annexation municipalities began planning bypass city named significant portion bypass designed incorporated remainder designed follow existing right way highway avenue construction began near present day highway highway highway work involved construction interchanges way stack highway large cloverleaf worst province decade completion according minister transportation september possible bypass toronto entirely lane divided highway composed highway extended west soon highway remained lane highway north airport expressway early 1960s expanded construction terminal serve expected demand expansion built new lane freeway north highway drive new route roughly followed route far known toronto airport expressway opened january featured connection western terminus southern end interchange interchange drive expansion announced highway widened lane highway collector express system modelled chicago plans soon developed apply model highway highway unveiled council october design work followed completed reconstruction involved junctions complicated multi level interchanges permit free flow movement construction began september widening highway required demolition rebuilding street road road constructed decade earlier junction built acres required construction bridges equivalent lane roadway junction acres required construction bridges equivalent lane roadway largest interchange canada opened traffic november required years construction staging fully opening december portions opened weeks prior prior renumbering rest route rebuilt prior completion interchanges completed project resulted creation highway north traffic entire airport expressway removed way new interchange new route included direct access airport extensions highway ultimately planned extend highway north future highway ramps direct northbound traffic highway extension north began work build highway included construction interchange freeways beginning work completed construction progressing section north boulevard opened end year construction began section highway extend road north project included extension avenue west highway avenue west completed late initial phase highway extended north highway began construction interchange interchange half completed extension opened late final grade intersections morning star drive left turn southbound lanes eastbound highway replaced making highway fully controlled access freeway entire length future environmental assessment completed northward extension highway major relieve traffic issues highway provide improved access temporary arterial road extension opened autumn designated regional road road serves provide improved access highway removed construction begins freeway extension technical designs prepared approved route far major timeline set construction inclusion provincial budget section highway campus road drive avenue expanded lanes direction project includes installation high mast lighting median barriers addition lane directions completion scheduled fall march ontario government approved extension highway north major road widening kilometres south road highway construction start extension widening completed addition government install high occupancy toll lanes run south highway north road toll lanes completed exit list following table lists major junctions noted exits
Ontario Highway 427