Simple "cordon tolls" - where motorists pay before joining a road - have been considered, as well as more sophisticated tolling technologies.
Making motorists pay for using roads has become a regular feature of councils' plans to raise revenue and tackle congestion. Authorities in Bristol, London and Edinburgh have all put forward road-pricing schemes.
However, environmentalists said that Aberdeen's move is "going about the problem in the wrong way". Simon Festing, a spokesman for Friends of the Earth, said: "Some of the money, preferably all of it, raised should be used to fund public-transport schemes."
Randeep Ramesh, Transport CorrespondentReuse content