Non-indicators, in my experience, are more often male than female. Talkers-on-the-phone-while drivers are more often (again in my experience) female. Runners through red lights are frequently male. There seem to be a more or less equal number of tail-gaters in both camps. So, 'Slob, have you based your observation on experience? To what do you attribute the difference between our observations? Do you suppose it's regional?