civicminded: Sounds similar to what a couple of guys in Toronto tried a number of years ago. The 401 is Toronto's major freeway. The speed limit is 100 km/h (62 mph), but traffic flow is anywhere from 130 - 140 km/h (81-87 mph).
So, these guys put signs on the back of their vehicles saying that they are going to test the 100 km/h speed limit and see how bad traffic gets (I can't remember what they were trying to prove exactly). They take up all the lanes and drive nose to nose at 100 km/h. The traffic is backed up for miles. Eventually they pull off the road and watch all the traffic speed up and sail by.
Anyway, a cop eventually showed up and actually arrested them all for "stunting". I'm certain they got off in court since they were actually obeying the lawful speed limit, but I never actually heard. Maybe I can find an archive...
EDIT: HA! I found it! I can't believe they actually charged them! Stupid, frigin, Canadian, anti-justice system...!!!!!
http://freerepublic.com/focus/f-news/678348/posts
diamondlarry: Someone threatened you over that? That's pathetic! I totally agree with you. I've done my fair-share of speeding in my life and done some really stupid stunts as a teenager, but no more. I go the speed limit in town on main roads, but under the speed limit on the highway and in residential zones.