THE HIGHWAY
Your car is traveling at 30 m.p.h. when the proverbial child dashes out in front of you. You hit the brake, of course. But with which foot? A few years ago, the question would have been ridiculous, but today the ubiquity of the automatic transmission with its clutchless floor board is making it the subject of a great debate among motor-vehicle bureaucracies. Some states encourage left-foot braking (among them, South Dakota and Michigan); some disqualify or penalize any license applicant who does it (Massachusetts, New Hampshire, Utah). Most states have no policy at all. And there is, in fact,...