So you're saying that a gps isn't accurate ? Especially compared to a car speedo . Yeah , right .
You do realize how many systems around the world rely on gps ?
Your point about traffic modelling is correct . If everyone drove at the same speed then it would flow much better . One person driving slower upsets this balance effecting everyone else . Hence the importance at driving at the speed limit where it is appropriate.
I'm quite sure those people don't understand this concept .
