Right. You can achieve that speed with a motor. You can achieve that speed with some really strong legs. You can achieve that speed with a nice, long, downhill. If that speed is too fast for the current conditions, set a speed limit. Enforce the speed limit. My car's speedometer went up to 120mph, but the highest speed limit I ever saw was 75. They didn't say, "That car goes too fast for this road. You can't have it here." They said, "Go faster than the number on this sign, and there will be consequences."