History of King's Highway 18B (Amherstburg):
The Amherstburg Highway 18B Business Route was created when a diversion was built to bypass two sharp curves on Highway 18 south of Amherstburg. It is not known when
this diversion was constructed, but it is believed to have been during the 1950s. The old alignment of Highway 18 along the Detroit River was designated as
Highway 18B for a number of years. The business route was 2.2 km in length. Highway 18B was decommissioned at some point in the late 1960s, but the exact date is not
known at this time. The old highway is now known as Dalhousie Street and Richmond Street. Since the entire route of Highway 18B was situated within the Town of
Amherstburg, the route was not assumed by the province.
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