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History of Provincial Highway 4A:
Provincial Highway 4A was a temporary designation applied to a discontinuous section of Highway 4 in the Walkerton area in the 1920s while the rest of
Highway 4 between Clinton and Walkerton was being built. Highway 4A ran from Highway 9 in Walkerton to Highway 6 in Durham. The 29 km road between
Walkerton and Durham was first assumed by the Department of Public Highways in 1927. However, the Highway 4A designation proved to be very short-lived.
Once Highway 4 had been completed between Clinton and Highway 9 in 1930, it opened up a continuous through highway from Clinton to Durham. The temporary
Highway 4A designation was therefore no longer needed. In 1930, the Department of Highways took the opportunity to renumber Highway 4A as part of the new
Highway 4 extension. The Highway 4A designation was permanently retired and was never used again in Ontario. Provincial Highway 4A was one of only two highways in Ontario that came into existence and disappeared prior to the changeover to the King's Highway designation in 1930. The other route was the Port Hope to Peterborough Highway (Highway 12A) which was renumbered as Highway 28 in 1928. Thus, Highway 4A and Highway 12A are the only highways in Ontario that were known solely as a "Provincial Highway" since they were not in existence when the "King's Highway" designations were first assigned in 1930. Photographic History of Provincial Highway 4A Learn More About Provincial Highway 4A |
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