There are off-leash parks in my area, by the way - are you sure there aren't any in yours?
There are some parks that have dog runs, but not all. People are permitted to walk dogs on these extend-a-leash contraptions that are downright dangerous because they are near invisible and allow the dog to go far anyway. But that's ok because it's a "leash."
I guess this is a narrow pet peave (pun intended) of mine. I have a wonderfully trained dog who I control better without a leash, she heels beautifully, than most people do with a leash. Yet I get harassed when she is walking at my side and we are minding our own business.
I walk her off leash, but because the parks are patrolled, I leash her when I walk in the park. Such is the irony of my situation.
I do sympathize with the hazards of running and dogs and cars.