I have this weird idea that speed limits should depend on the safety of the roads. Highways with four lanes per direction and slow, easy curves should have no speed limits (but carefully policed safety laws like tailgating and using the passing lane only for passing). Speed limits should drop when there are good reasons for it -- construction, junctions where people need to be able to get up to speed safely when they first come on a road, neighborhoods, etc.

Right now, in America, speed limits are usually arbitrary, encouraging people to ignore them -- even when there are really good, non-obvious reasons to slow.

I think laws should be sensible, followed, and strictly enforced when broken.