 However, it was removed between 1928 and 1935 and replaced with paved trackage open to mixed traffic.However, since then, road traffic had increased and was degrading the reliability of streetcar service.Given the success of the new 510 Spadina route along dedicated right-of-ways on Spadina and Queens Quay and on portions on several streetcar routes, the TTC proposed to upgrade the St. Clair streetcar line to a dedicated right-of-way.