yea Im with unaluna here its very dangerous to be flipping the bird to passer byers. theres no way to know the person you may be flipping off may have their own mental illnesses, or problems that day, and carrying a gun, knives, bombs or other weapons. you flip off the wrong person.

also something to consider with all the political crap going on in the USA, some states, cities and towns are cracking down on behaviors that can incite violence and riots, road rage, and such so in some of these location flipping the bird is actually illegal (inciting violence, city morality codes, misdemeanors and other such laws that some cities have recently enacted ...)

my suggestion since traffic and other pedestrians bother you when you run you might invest in a treadmill and some wall papers where you can run in the comforts and privacy of your own home, or go to a gym were you can do things like run and watch a movie or run on a track during times when there are no others around.