Currently, the buses and transport of Yerevan do not have a single consistent brand. All the buses are different colours, they have adverts in different places. This is unprofessional and not befitting of a capital city transport network. It also makes it hard for tourists to know what is a city bus, what isn't. It also doesn't look very nice!
My suggestion is creating a city transport brand for Yerevan. It will be in the common theme of the Metro brand, and will be called "city bus" or "QaxBus" in Armenian. It will have a strong modern logo, which will be shown on all buses , all tickets, and all related literature.
You may find my suggestion following the link "City Transport Brand For Yerevan".