The ACT Opposition says not much will change for north Canberra commuters when the Government's new rapid transit bus service is introduced.

MLA Alistair Coe says timetables for the service show only a few minutes will be cut from normal bus travel times from Gungahlin to the city during the morning peak.

He says only one minute will be cut from existing daytime services and in the evening, there is no time savings at all.

"It's not going to be a rapid transit system like Mr [Jon] Stanhope has promised, it's really going to be additional route buses," he said.

"Now, additional route buses is something we welcome.

"But he can't mislead the people of Canberra and say it's going to be an express service when it's going on the same roads, stopping at the same traffic lights and has all the other major problems that the existing bus system has."