Major construction at Toronto’s most complex streetcar junction will get underway on March 31, 2021. The City of Toronto issued a construction update notice on March 12 including the map below showing the configuration of traffic from March 31 to July 21.

During this phase of construction, there will be no through traffic on Queen Street west of Triller Avenue nor on Roncesvalles at Queen. The north gate of the carhouse will remain as a service access for streetcars and for a revised 504 King shuttle bus.
The King Shuttle will be broken into two segments:
- 504G Dundas West Station to Roncesvalles Carhouse
- 504Q Triller Avenue to Strachan Avenue
For service designs, please see my article on pending schedule changes effective March 28, 2021.
A single lane will be maintained in each direction for traffic between King Street and The Queensway. 501 Queen buses will divert via Dufferin and King Streets to use this link. Traffic on The Queensway will use the central lanes while construction in the curb lanes is underway
Westbound service on Queen from Dufferin to Triller will be provided by the 504Q shuttle looping via Dufferin, Queen, Triller and King. There will not be any eastbound service, and riders will have to go around the loop to travel eastward.
Pedestrian crossings will be shifted away from the intersection outside of the work zone, and there will be no crossing on the west side.
In the second phase of this project between July 22 and November 23, the connection to King Street will be closed off for construction and Queen/Queensway will reopen for through traffic. Details will follow in a later update.