The massive waste of resources involved in hauling 2 tons of steel and glass down from speed to 0, for _absolutely no reason 99% of the time_, accelerating it back up to speed again, just to do the same, over and over, boggles the mind. The noise pollution, the air pollution, the "trash" byproducts in the form of brake dust and tire dust. Why on earth would you voluntarily do this to your neighborhood? It doesn't stop speeding; it's a crappy form of traffic control, and it makes every traffic-related measure of living near it worse. Add to all that the time wasted. I feel the same way about traffic lights, particularly the over-proliferation of red arrows everywhere, telling us that we can't judge for ourselves when it's safe to go, and instead, we have to create gridlock and extensive waits for minimal gain.
Most of these problems could be solved by keeping traffic at a moderate, consistent level through the use of roundabouts, rather than the waste of constant stop-and-go.
When I rule the world, there will be a ban on 4-way stops, red arrows, and parking lots without walkways. I don't even have kids, and I find it infuriating that parking lots force us to walk behind rows and rows of parked cars, hoping that we don't get run over by someone backing out of a space in one of the ever-increasingly-difficult-to-see-out-of cars we're bringing to market in the name of 'safety'.