Spend the money elsewhere

The roads are fine as they are. Assess individual areas near schools and small villages, and potentially change some of them to 20mph but a blanket change is ridiculous. This money could be better spent on public services and schools. Monitor the roads better and deal with careless drivers to better solve the problem. If anything, it’ll make the situation worse because drivers will become impatient and there will be increased delays and congestion, slowing down daily life.