 The section north of Townline Road was completed within a year . Around the same time , the third and final contract was tendered for the section north of Highway 3 . On May 20 , 1972 , the Main Street Tunnel was opened to traffic at a morning ceremony featuring local officials and the Welland Police Association Pipe Band . Highway 140 was opened several months later , without ceremony , on October 5 . It has remained unchanged since then , and was not affected by the provincial highway transfers in 1997 and 1998 . 
