There is a stretch of North Glebe Road, in Arlington, Virginia, that epitomizes the American approach to road safety. It’s a sloping curve, beginning on a four-lane divided highway and running down to Chain Bridge, on the Potomac River. Most drivers, absent a speed limit, would probably take the curve at 30 or 35 mph in good weather. But it has a 25-mph speed limit, vigorously enforced. As you approach the curve, a sign with flashing lights suggests slowing further, to 15 mph. A little later, another sign makes the same suggestion. "Great! the neighborhood’s more cautious", residents might think.

We’re being protected. But I believe policies like this in fact make us all less safe.