Is lane choice based purely on preference?

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I've spent the last few weeks in the US on both the West then the East coast and it seems like the choice of lane is entirely based on personal preference, Is this the case of am I missing something?
I quite like the way people pas either side depending on where the space is, but I'm I have no idea if I'm breaking the law by following the example of others.

How is it meant to work over here ?

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Dr JonboyG said:

Some states are more tolerant of it than others; CA freeways are basically a free-for-all, both with regards to lane choice and speed limits.

Seems that way in Florida as well

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Matt Harper said:

whoami said:

I've never managed to determine the law regarding this.

Much opinion, but never a categorical statement of law.

Odd.

Not odd - it varies from state to state. In FL it is legal to pass on the right in situations where there are two or more lanes traveling in the same direction - or when you are passing a vehicle that is turning left (as long as you remain in the travel lanes i.e. you have to stay on the road, rather than pass on the median/sidewalk/turn lane etc.)

In states where it is not (technically) legal, it's never enforced, unless it is deemed as "aggressive lane changing" (weaving). The country would grind to a halt if it was enforced.

I quite enjoyed it.
What is quite Ironic is, I spent a few weeks driving V6's in the US and have to come back to the UK so I can drive a proper American V8