Well, it's been working very well for my part of the neighborhood. People are actually going the other way so they don't have to navigate thru my "road block".
And as far as the cops go, my neighbor called the cops when his first dog got ran over and they basically say tough luck. Because they weren't there to catch the speeder so they can't do anything. Shortly after that, his second dog got ran over. My part of the neighborhood had been fine since I set up my "road block".