On the bus this morning?

[E2e4]

I have run across this sentence

"On the bus this morning, I saw golden leaves falling from some trees."

Having read above sentence I've got on my mind that the trees had been growing on the bus.
Also leaves were falling from some trees only and from some others not.
I wonder if "on the bus this morning" is an adverbial clause wrongly used as an incomplete, in other words, wrong modifier?

Please let me know if any of the following sentences are correct. If not, please let me know how to say this properly.

1. Being on the bus this morning I saw some golden leaves falling from all-around trees.
2. From a bus I was on this morning, I saw some golden leaves falling from (all-around) trees.
3. From a bus I took this morning, I saw some golden leaves falling from trees.

Thanks

[Beeesneees]

It's fine as it was originally written on the forum. Common sense has to be applied. It is obvious that it does not mean the trees were on the bus. To extend it formally, the best solution would be
As I was riding on the bus this morning...

There is absolutely nothing wrong with 'falling from some trees' - they were falling from some trees, but not from others.
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Cheers m' dears!