Speeding is a tricky issue because of the wide variety of types of roads. For instance: four lane, divided highways yield fewer fatalities without any speed limits. (This is known as the 'Montana Paradox'). http://www.hwysafety.com/hwy_montana.htm
But then, isn't having an appropriate speed limit for the type and layout of the road still the issue? What makes it tricky, if we consider the safe speed on straight open 4 lane roads to be 90 and an urban street with frequent crossings to be 30?
