When the "auto" mobiles first came out, you had to have someone in front waving a flag to alert those on horses and in carriages that you were coming. I figure

When the "auto" mobiles first came out, you had to have someone in front waving a flag to alert those on horses and in carriages that you were coming. I figure this is the modern day equivalent (and about as useful). http://en.wikipedia.org/wiki/Red_flag_laws http://en.wikipedia.org/wiki/Red_flag_laws