History of King's Highway 21A:
King's Highway 21A was an alternate route to Highway 21 which ran from Port Franks southerly to the Highway 7 & Highway 21 Junction west of Warwick.
The highway was very short-lived; it existed for only four years. The first section of Highway 21A was commissioned on April 11, 1934. On that date, the
road from the Highway 7 and Highway 21 Junction west of Warwick to Forest was assumed by the Ontario Department of Highways (DHO) and designated as
Highway 21A. In 1936, Highway 21A was extended northerly from Forest to Port Franks. The Forest-Port Franks Road was assumed by the DHO as a new
portion of Highway 21A on August 19, 1936. The extension of Highway 21A in 1936 brought the total length of the highway up to 32 km. In the late 1930s, a
major route renumbering took place in an effort to simplify route numbering in the area. The entire route of Highway 21A was redesignated as Highway 21 in
1938.
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