Is intentionally driving ones car into a large body of water and staying inside considered s uic ide?

Ok you said with the intention it's suicide, but your other examples you weren't sure of.

Do you mean if someone is a daredevil, an adrenaline junkie, and does questionable things, that can get them killed?

I mean even getting inside a car and driving already has some risks.

A matter of quantity and not quality?

Sorry I have not come to bring answers, only further questions.

I'll also say your examples though might not only hurt the 1 person Doing it, but others as well, as they might cause other accidents. Not good at all.