Sixty morning peak buses from the north-west into the city will be rerouted via the Cahill Expessway to try and relieve congestion.
Between 6am and 10am buses from Dural, Cherrybrook and West Pennant Hills will enter the city by the Cahill Expressway and travel down Bridge, Pitt, Hunter and Castlereagh streets before terminating at Market Street.
The services included in the initiative are the 620/620X, 642/642X, 650/650X and the 652X.
Dural bus customers affected by these changes will have to continue their journey to the southern CBD by transferring to Newtown bus services (422, 423, 426 and 428) at no extra charge.
Customers travelling beyond Market Street towards Railway Square can transfer to Sydney Buses services 422, 423, 426 and 428 at no extra cost.
Hillsbus said there were some minor changes to the running times of the services.
Transport minister Gladys Berejiklian said it would make the bus services more reliable.
“I have experienced first-hand the frustration when you get stuck on the Harbour Bridge on a bus and in York St.”
There are no changes to services leaving the city during the morning peak or to any PM peak services.
A dedicated phone line was established to answer any questions.
In an effort to relieve congestion in the Sydney CBD the government is also:
*Trialling double-decker buses;
*Building light rail to reduce the number of buses in the CBD;
Traffic signalling and parking changes; and
*The formation of a dedicated police motorcycle team for the Sydney CBD to target motorist behaviour which increases congestion, such as queuing across intersections.