This image shows a section of the Trans-Canada highway as it approaches the north shore of Lake Superior near the town of Port Arthur, Ontario.
Alutone Reproductions by E. S. & A. Robinson (Canada) Limited, Leaside, Ontario
The description states:
CANDIAN LAKE SUPERIOR POST CARD SERIES
A stretch of the scenic Trans Canada Highway between Sault Ste. Marie and the lake head cities of Port Arthur and Fort William, Ontario.
–The two towns mentioned have merged into the single city of Fort William.
This image likely dates from the 1950s.