You can drive however you want, too. But if you damage someone or their property, you will be liable for that.
Perhaps not quite "however you want". Threats are a form of aggression too, and the use of proportional force to repeal such threats is acceptable. The same way you cannot shoot towards an innocent crowd - even if you don't hit anyone -, you can't drive totally recklessly, threatening other drivers or pedestrians - even if you haven't yet damaged anyone, your behavior can be seen as a threat.
But more important, we should note that in a free society, streets and roads would have owners, who would be free to set their arbitrary rules for the usage of such roads if they want to.
To vampire:
Blasting strong sounds over somebody property is an obvious aggression, as with any so-called "negative externality". Important to remember that the principle of "proportional force" always remains when dealing with any [attempt of] aggression.
And finally, concerning "public obscenity" in a free society, then it really depends on the owner of the place you are. If, for example, you are in a condominium where people are allowed to have sex on the streets during daylight, then well, they are allowed, I think we can safely conclude most places would not allow such things though.
Now, seriously, would it be that difficult to realize what I've just wrote you by yourself? Are you limited in your imagination and deductive reasoning, or you just like to throw here whatever comes up in your mind instantly, without even trying to think for a couple minutes what the answer to your challenges would be? If this was your first contact with libertarianism I could understand it, but I don't think this is the case - or is it? I really think you could answer those things yourself, if you actually wanted to.