I'm more worried about the dogs that 1) come from behind something before you know it or 2) see you coming from farther away and are coming towards the road. Number 2 meaning I don't want to run into a chasing dog and wreck. Earlier this spring I had one bite into my neoprene booties.
Personally I would hate to see my dog hurt someone so it is never off the leash when outside or uncontrolled. It's the owners responsibility to control their dogs, and if ever one does bite me or cause me to wreck the law will be contacted at that moment. What if its a younger kid riding by....bad stuff can happen.