Roundabouts
Roundabouts are brilliant, but they don't stop maniac drivers showing off.
Like mini peanut shaped roundabouts[1].
[1]: http://www.swcivil.com.au/images/peanut-roundabout-warrnambo...
but they probably don't increase maniac drivers showing off either.
In my neighborhood, some a**.... did donuts in a regular four-way stop intersection. In a previous neighborhood, another a**.... burned rubber on a regular straigh road.