History of King's Highway 2B:
King's Highway 2B was created out of a route renumbering in 1961, when an alternate route of Highway 2 through Downtown Chatham was re-established as a B-suffixed business route. The short business route was previously known as Highway 2A (Alt), until the route number was changed to Highway 2B effective February 7, 1961. The route of Highway 2B branched off of Highway 2 at the intersection of Richmond Street and Keil Drive. Highway 2B then followed Richmond Street, Queen Street, School Street, 5th Street and Thames Street through Downtown Chatham. The route joined up with Highway 2 at the intersection of Thames Street and Grand Avenue. The route of Highway 2B remained unchanged until 1970, when the Chatham Business Route was apparently decommissioned. Department of Highways' mileage tables stopped listing the route of Highway 2B after 1963, but the highway continued to be shown on the Official Road Map of Ontario up until 1970.