I've been in a few 'street fights' and I kept my feet firmly on the ground. My training was boxing and it's been a long time since I fought. I had a couple of guys try to kick me and it didn't work out well for them. They were wannabees that had watched Bruce Lee.
Times have changed. But I still believe that in the street fight people would be better served with a leg sweep at most.
Thanks for a good look at kicking in self defense. It's a good thing to be aware of.