http://www.nhtsa.dot.gov/people/inju...oc/nhspeed.pdf
http://www.gencourt.state.nh.us/rsa/...265/265-60.htm
Commisioner Sweeney (Dept of Safety) testified to the R, R & D to his successful convictions using this law. You might find this interesting, but you can use this law to fight a speeding ticket if you can prove that given the conditions you were driving reasonable and prudent, regardless of the posted speed limit. (This is how Commisioner Sweeney explained it to the committee, not me) For example: a performace car on rt106 traveling at 65 mph and no traffic may be perfectly reasonable and prudent. It can handle and stop better than a minivan and there were no other cars on the road.
Keep this in mind with your next speeding ticket.