Dog Tries Biting Speeding Cars

Here is an interesting video I found about a dog snapping at cars as they pass by (presumably on some freeway).  By the way my dog, Tucker loves to stick his head out the window while in the car, but he never tries to snap at cars like this dog does (though he does bark sometimes when people he doesn't know get too close).  By the way, I do feel somewhat sorry for the dog in this video since what happens if a speeding car got too close to the window and hit the dog?  Perhaps they need to train the dog not to snap at cars.