History of King's Highway 39B:
King's Highway 39B was a short-lived business route which served the towns of Tecumseh and St. Clair Beach. The business route was created in 1961, when Highway 39 was relocated onto a new alignment. Construction began on the Tecumseh Bypass in 1960, and the new highway opened to traffic in late 1961. The new highway bypassed an original section of Highway 39 which passed through the two towns. The old route of Highway 39 also had two at-grade railway crossings on it, which were bypassed by the relocated highway. The old route of Highway 39 was renumbered as Highway 39B. The route of Highway 39B was officially decommissioned on August 10, 1962, when jurisdiction over the provincially-owned section of Highway 39B lying between the east limits of Tecumseh and the Highway 39 Junction near the Puce River Bridge was transferred from the Department of Highways of Ontario (DHO) to the County of Essex. The section of Highway 39B running through Tecumseh itself was municipally-owned prior to 1961, and was thus considered a non-assumed section of the King's Highway. The former route of Highway 39B followed Tecumseh Road East through Tecumseh and then followed Brighton Road & Old Tecumseh Road through St. Clair Beach.