Two more high-frequency bus services should be added to Brisbane's public transport network to fill gaps for residents of eastern and northern suburbs, the Greens say.

Alongside the existing Blue and Maroon CityGliders, which run through the heart of the CBD and out to the western suburbs respectively, the Greens want additional east-west and north-south services.

Brisbane's Blue CityGlider operates as a high-frequency service. Credit:Lucy Stone

Greens councillor Jonathan Sri (The Gabba) said the 24-hour high-frequency services were "the best way to reduce congestion and ensure people can get home at all times of the day and night".

CityGliders operate at intervals of between five and 15 minutes, 18 hours a day from Sunday to Thursday and 24-hours a day on Friday and Saturday.