There's a third choice, though. It's bad when speed limits are much lower than the natural speed of the road, for the reason you describe. And it's good when the natural speed of the road is the safe speed of the road. But in addition to those two, it's also possible to introduce fast, automated enforcement— speed cameras.

This, of course, applies just as much to the actual topic of the Economist article; new inheritance taxes are just and good, but they should be written to be enforceable, and then they should actually be enforced.