Kendall's right overall, though, because the speed a car is capable of going isn't the reason speed limits are set where they are. On most highways/motorways, there are drivers with a broad range of capabilities, many of whom are incredibly dangerous if they try to drive as fast as the faster drivers would like to go. On roads like the Autobahn, it is understood that you shouldn't be there if you can't handle the absence of a speed limit. But most highways/motorways are not like that (nor should they be, since everyone's tax money pays for the roads - those that are not toll roads, anyway).

You share the road with a lot of people, may of whom simply cannot drive at very high speeds safely, either because of their own abilities, or because they don't have the newest and best cars. And there are people who are experiencing varying amounts of fatigue as well as the people who are driving and shouldn't be. They're there, whether you think they should be or not, and you driving fast increases your chances of getting entangled with them in a very unpleasant way. The speed limit takes all of this into consideration. Speed limits are not irrationally low when all of these things are factored in. As I said before, in my opinion, they are too high.