Toronto needs one way streets  to alleviate congestion and flow traffic.  

Queen one way WB  from River St. 
King one way EB to  River St
Yonge  one way SB south of  Bloor ( two way north of Bloor)
Bay one way NB to Davenport. 
Church one way NB  to Yonge St intersection, 
Jarvis one way SB  from Charles.