Everyone thinks they’re a good driver. Despite this, the annual death toll on our roads keeps going up—despite ever-safer vehicles—and human error is to blame for 97 percent of all fatal crashes. Bad driving isn’t just about crashes, though; racing from stoplight to stoplight is bad for the planet, since it adds unnecessary carbon to our atmosphere at a time when we can ill afford it. In the age of the connected car, it has become trivial to quantify just how good or bad a driver one is; for some time now, some insurance companies have been supplying customers with plug-in devices that can track their driving and—assuming it’s good—offer a discount as a result. But you don’t even need one of those dongles to do that, as some new cars can do that tracking on their own.