posted speed limits don't really bother me. Locally the speed limit is 65 on limited access highways, and thats generally my cruising speed on such. I can understand the 55 limit on curvy old highways like merrit, taconic, huchinson. Enough people run off the road and into trees on those roads that its worth it to drive slower.
Driving all over the country I do think a lower speed limit has the result of more driver awareness scanning for cops, so im not really bothered when the limit seems 20mph slow.
whenever I cross upstate NY, im speeding by 10-15mph and im so in tune with the surroundings and police scanning activity, that i reach a new level of driving focus, and i still occasionally get a ticket.