> Rate limit and monitor your own usage. You should anyway. It's not the road's job to make you follow the speed limit.

In some sense, urban planners do design roads to make you follow the speed limit. https://en.wikipedia.org/wiki/Traffic_calming:

“Traffic calming uses physical design and other measures to improve safety for motorists, car drivers, pedestrians and cyclists. It has become a tool to combat speeding and other unsafe behaviours of drivers”