Bus services should get "a fair crack of the whip" when the new Forth Bridge is created, MSPs have been told.
The Scottish Government will spend between £1.7 billion and £2.3 billion - at 2016 prices - on a 2.7km bridge for Edinburgh and Fife commuters.
The current bridge, opened 46 years ago and now deteriorating, would be used for public transport, cyclists and pedestrians.