[Wanderer]

I'd echo DucDave here - and I'm not unaware of the differing infrastructure needs of the EU and US. What does suprise me is the very granular nature taken to road and traffic flow design here, each instance/obstacle is dealt with in a very comparmentalised way - speed limits for individual corners, stop signs at intersections. Speed limits set by road-type is very useful, as soon as you hit a given type of road, you know what your limits are - not playing the spot-the-sign game as you hit a new road each time.

The lack of roundabouts is a big suprise - for the space of a 4-way stop, you can place in a mini-roundabout, and keep traffic flowing much more easily (and imo, reduce the chance for certain types of accident at the same 4way stop)
This scales up pretty well also - large multi-lane roundabouts are practical and usable, as long as people understand how to enter/navigate/exit them, and keep traffic flow going.

On my daily commute through dracut, I count about 7 stop lights/signs in a 3 mile stretch. Traffic at these can get seriously backed up - cant help but think it could be done more efficently. But it does seem to be a symptom of the system and/or design ethos