Some city-bound bus services will change routes from next week as State Transit tries to manage an increasingly congested CBD.

Commuters on city-bound buses travelling over the Anzac Bridge and south over the Harbour Bridge faced delays of more than 15 minutes this morning, triggered by congestion.

Bus congestion in the city has forced State Transit to change some routes. Credit:Andrew Quilty

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The congestion has been caused by the steady rise in the number of buses, both State Transit and private, entering the city in the morning peak hour.