Between Hamilton and Welland, several major diversions were constructed during the 1930s, including west of Elfrida (the old route followed South Townline Road and Chapel Hill Road), east of Kimbo (the old route now known as Kimbo Road) and around St. Anns (having originally followed Twenty Mile Creek Road and St. Anns Road). In 1938, construction began on a large traffic circle between Highway 20 and the QEW in Stoney Creek and on a cloverleaf with Lundy's Lane in Niagara Falls; both were completed prior to the opening of the QEW on August 23, 1940. Highway 20 was now , its peak length.