As parents, many of us look back on the racetrack sets we had as children with fond memories of fun and exhilaration. To be sure, the racetrack sets we possessed allowed us to witness our toy cars rocket around in circles, flying around the corners and reaching record-breaking speeds (for toy cars, at least). Without real cars of our own, this was the next best way to satisfy our need for speed. But while the racetrack sets we had as children may have been a hit then, modern era track toys have...