The annual St. Patrick's Day parade will mean trouble for drivers trying to navigate through the downtown on Sunday — and a subway closure will mean headaches for transit users.

A number of road closures will affect traffic in the city on Sunday.

The parade starts at noon on Bloor Street West, eventually heading south to Nathan Philips Square.

But the road closures will start at 8 a.m. and they are extensive: St. George from Bloor to College; Bloor from Huron to Yonge; and Bay from Queen to Dundas.

The full list of closure can be found by clicking here. 

The TTC is also closing a portion of the Yonge-University-Spadina line on Sunday for track repairs.

There will be no service from St. George to Union station.

Parade director Alan Louthe says organizers are expecting 500,000 people to line the route and he hopes they'll relax and enjoy themselves.

"We would like for people to come out and enjoy the day," said Louthe,  "And for those drivers who get frustrated, just count to 10." 

Police say they'll get the traffic back to normal as soon as possible, but probably not until after 2 p.m.

Full TTC service resumes Monday at 6 a.m.