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406號公路南端設於[[威蘭]]市一座[[迴旋處]]，在此與東緬街（{{lang|en|East Main Street}}）平交並經該街道與[[緬街隧道]]接駁。公路從此處起以雙程分隔及來回四線佈局往北伸延並大致與[[威蘭運河]]平行，跨越延齡草鐵路（{{lang|en|Trillium Railway}}）後再與活朗道（{{lang|en|Woodlawn Road}}）和戴姆勒園林路（{{lang|en|Daimler Parkway}}）交匯，之後跨越威蘭河（{{lang|en|Welland River}}）和威蘭運河的舊水道<ref name="2010 mapart">{{cite map | title = Ontario Back Road Atlas | year = 2010 | publisher = Peter Heiler | cartography = [[MapArt]] | page = 19 | section = R33–T34 | isbn = 978-1-55198-226-7}}</ref> 。（威蘭運河的東繞道於1973年啓用，自此取代途經威蘭鎮中心的舊水道。）
公路到達威蘭運河舊水道的對岸後往西北拐，與梅里特道（{{lang|en|Merritt Road}}）交匯後貫穿羅便臣港道（{{lang|en|Port Robinson Road}}）。公路過去曾與羅便臣港道以交通燈平交；該平交路口於2013年移除，而當局正在該處興建高架橋讓羅便臣港道跨越406號公路，完工前公路兩旁的羅便臣港道暫不貫通。
| publisher = Ontario Department of Highways
| year = 1971
| page = 12}}</ref>。公路其後以來回合共雙線的格局往南延至威蘭河畔，並在梅里特道駁上58號公路<ref>{{cite map | title = Southern Terminus of Highway 406 in 1986 | cartography = United States Geological Survey | publisher = Microsoft | date = July 1, 1986 | url = http://msrmaps.com/image.aspx?T=2&S=13&Z=17&X=402&Y=2978&W=1 | accessdate = July 29, 2010}}</ref><ref name="Jackson">{{cite book
| title = The Welland Canals and their communities