The Nottingham tram, not far from Coventry, usually only shares road with cars in the city centre which is mostly pedestrianised. So mostly avoids commute traffic.
Quite a few do, and the point remains that sharing or not sharing the space with cars isn't a feature that distinguishes trams from buses. You'll can - and do - have dedicated rights of way for both, and you can - and do - share routes with cares for both.
I know of no bus routes that completely separate from cars beyond a strip of paint. I also know of no countries that give buses automatic priority over cars outside of bus lanes.