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| page = 447
| url = http://books.google.com/books?id=o-sI64yldu4C&pg=PA447&dq=Highway+406&hl=en&ei=rDFSTMDgCsSblge32dCcBQ&sa=X&oi=book_result&ct=result&resnum=3&ved=0CC0Q6AEwAg#v=onepage&q=Highway%20406&f=false
| accessdate = April 26, 2011}}</ref>；此延伸路段於1971年6月30日開通<ref>{{cite press release |title= Need to add | author = Information Services | publisher = Department of Transportation and Communications | date = June 28, 1971}}</ref><ref>{{cite map
| title = Ontario Road Map
| issn = 0714-1149}}</ref>。
406號公路曾是安省400系列公路系統中，僅餘設有來回合共雙線非分隔行車路段和交通燈平交路口的公路<ref>{{cite map | title = Ontario Road Map | cartography = Geomatics Department | publisher = Ministry of Transportation of Ontario | year = 2010–11 | url = http://www.mto.gov.on.ca/english/traveller/map/ | accessdate = December 16, 2011}}</ref> 。當局本來計劃在雙線路段於1970年代落成後隨即興建另外兩條行車線，但計劃一直押後至2000年代初才落實<ref>{{cite news |title = 406 Needs Drive |publisher = Quebecor Media |work = Niagara Falls Review |date = May 2008 |url = http://www.niagarafallsreview.ca/PrintArticle.aspx?e=1030232 |accessdate = December 16, 2011}}{{dead link|date=2017年12月 |bot=InternetArchiveBot |fix-attempted=yes }}</ref> 。項目首期將介乎河貍壩道和羅便臣港道之間的雙線非分隔行車路段擴濶至來回四線行車，並設中央分隔帶，於2007年通車<ref>{{cite report
|title = Southern highways Program
|publisher = Ministry of Transportation of Ontario