Ich fahre Bus.
I drive a bus. (=I'm a bus driver.)
I ride the bus. (= I travel on a bus as a passenger.) ?
- Why do you use Bus with no article here?
If you say
In this case "Bus" is treated like a mass noun just like water.
The fact that English needs an article in your examples has more to do with the verbs that can't handle mass nouns, I guess. It does seem to work with car brands though... at least in colloquial use
Anyway. Here's an example that shows that treating bus as a mass noun is not unknown in English.
As stated previously, Ich fahre Bus can mean either or. For future reference, when you're traveling somewhere by way of something, you would use mit. For example:
An exception to this would be using your feet: