Part of this may be a phenomenon that race drivers have known for quite a while: Speed isn't nearly as dangerous as differences in speed.
Now that the speed limit is 70 in many places, the people who want to stay within N of the speed limit now go faster, and the people who want to drive however fast they want to drive are still driving the same speed: the speeds have gotten closer together.
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Now that the speed limit is 70 in many places, the people who want to stay within N of the speed limit now go faster, and the people who want to drive however fast they want to drive are still driving the same speed: the speeds have gotten closer together.