History of King's Highway 18A:
King's Highway 18A was a rather strange alternate route to Highway 18 between Malden Centre and Kingsville, via Colchester. The highway was first
assumed by the Ontario Department of Highways as a new King's Highway on April 13, 1938, at a length of 30 km. It was initially a gravel highway, but it
was paved in its entirety in 1951. The highway was retained in the King's Highway system until 1979, when it was decommissioned. Since 1979, the road has
been known as Essex County Road 50. King's Highway 18A holds the record for being the southernmost signed provincial highway in Ontario, as well as
Canada. The route of Highway 18A actually dips south of the 42nd parallel for several kilometres near Colchester, the only highway in Canada to do so.
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