Early data shows bike lanes added on a stretch of Bloor St have tacked on eight-and-a-half minutes to driving trips during the afternoon rush.
The year-long pilot which takes a way of traffic lane in each direction between Shaw St and Ave Rd launched in mid-August 2016. The data was collected through September and October.
Travel times for drivers between Bay St and Ossington Ave during the morning rush were extended by about four minutes. The delays come even though there was a recorded 22% drop in the number of cars on Bloor in the pilot zones. The city says there has not been any significant change in traffic volume on parallel routes like Dupont St or Harbord St.
READ the city's bike lane pilot update
While the lanes may be frustrating drivers they seem to be a hit with cyclists.
Data shows the number of people pedalling in the pilot zones went up 36% to 4,500 a day.
The city concedes there is room for improvement.
They vow to tweak the timing of some traffic lights, adjust some turning restrictions, make changes to parking and loading time of day allowances, look at bike lane design approaching intersections to make it easier to turns, changing signs, pavement markings, flexi-posts and rubber curbs.
92% of 8,100 cyclists who responded to an online survey said the lanes made them feel safer. 34% of 2,300 driving respondents agreed that lanes improved safety.
53% of local business owners are supportive of the lanes while 41% oppose them.