But I digress. Having moved back here after many years driving in Europe, my analysis of road habits may or may not be mainstream. My findings indicate that, contrary to your listener's opinion, personal appearance has little to do with bad driving. Indeed, most people here look strange. Age, however, is a significant factor.
Car make and class are also very important in determining risk to other drivers.
We all know this intuitively, but I believe mine is the first study to prove it scientifically. This category includes such negative driving skills as slow-speed driving, unpredictable maneuvers, hesitation in intersections and grooming at the wheel. Most can be disposed of summarily, although there have been noted several qualifying factors which naturally increase risk substantially. Trucks on at least the third engine. The risk is doubled with Baja California plates, but only if the truck is emitting smoke from its cab or tailpipe.