i like the part where you get a signal if someone is to close behind you .. i wish every car here had that, so pushing them would really make a difference
do you really want everyone to know where you are, what you are doing, at every time? I guess you don't have a girlfriend then .. You'd know better.. and by the way, do you think your mom (for example) would turn on the computer, log in to some kind of website, to check if you don't happen to be driving around? I guess just taking her cellphone is very much quicker .. Maybe you'd better insert some bluetooth handsfree-thing
besides my comments... it DOES have the cool-factor ! I'm curious!