That's just drivers normalising the breaking of the speed limits. If you raise the limits just because drivers are going faster, then the drivers will just increase their speeds until again, a majority of drivers are breaking the limit.
Speed limits should be defined to reduce the harm from the inevitable crashes e.g. we have a lot of 20mph limits here in the UK in cities such as Bristol which are designed to reduce pedestrian deaths.
Personally, I think roads are poorly designed - they often prioritise speed which then encourages drivers to go faster (e.g. long sight lines, sweeping corners etc) and then a speed limit is applied. I think the better alternative s to design roads so that drivers naturally travel slower, or at least the careful ones do.
Speed limits should be defined to reduce the harm from the inevitable crashes e.g. we have a lot of 20mph limits here in the UK in cities such as Bristol which are designed to reduce pedestrian deaths.
Personally, I think roads are poorly designed - they often prioritise speed which then encourages drivers to go faster (e.g. long sight lines, sweeping corners etc) and then a speed limit is applied. I think the better alternative s to design roads so that drivers naturally travel slower, or at least the careful ones do.