Believe it or not, the correlation between higher speed limits and vehicle fatalities is practically non-existent. Most studies done focus on highway fatalities, rather than local road fatalities, and there is some evidence to suggest that speed limits make some sense (from a safety perspective) when referring to the latter. The 90 per hour (fixed maximum speed) would mean little on local roads however, particularly in areas with large numbers of intersection (where a person could not reasonably achieve those kinds of speeds in the first place between many intersections). While speeding tickets are most certainly a "cash cow" for local and state governments, almost all unbiased research on the link between speed limits and highway fatality rates has shown that when speed limits go up, fatalities stay the same (or in many cases actually decrease). Keep in mind as well that when the national speed limit was established, it was for fuel economy in light of the oil crisis, and not for safety reasons. A look at Germany's Autobaughn (a system of highways with no speed limit in about 90 percent of its roadway) is a bit of a revelation. The fatality rates for autobaughn motorists are significantly lower than those in the United States. Evidently it is something other than lower speeds responsible for its relative safety. In fact, banks and curves of the autobaghn are regulated to be smoother than that which would be allowed in the states. It is better funded, (meaning that it is paved more regularly, and has a concrete median on almost all stretches) and traffic laws punish the far more dangerous apects of driving than speeding, (Switching lanes frequently, cruising in the passing lanes (or driving slower than those NOT near the median), and tailgating). These things are frequently observed in the US, but rarely ticketed. Our "driving culture" is what is responsible for our fatality rates...not our speed. Higher speeds on highways actually cause most people to naturally pay more attention to their driving. (As do steep grades, narrow roads, and many other roadway phenomena). In any event, 90mph is STILL speeding, even by today's standards on EVERY US highway that I am aware of. Even if it was established that higher speeds were linked with fewer fatalities, a 90mph speed cap on vehicles would make no practical difference. It would be far more effective to invest in our roadways (now literally falling apart in many areas, and in terrible disrepair in others), and perform some much needed safety upgrades while continuing the pattern of increasingly safer vehicles being manufactured.

no, but some 25 + series trucks already have one at 97mph, most pass. cars are limtied to 155 mph http://www.answerbag.com/q_view/1540352 refers to my q