This is quite different to my part of inner-suburban Australia. I find drivers here to be almost universally polite and accommodating. And there is barely any speeding. Someone doing more than 1-3 km over the limit on the expressway is a clear outlier. Maybe it's only like this around here though.

I have driven tens of thousands of kilometres in the US on roadtrips, and the driving there is quite insane - speeding and dangerous, aggressive manoeuvres. Doing 10-20km over the limit is standard and anyone sticking to the limit is the outlier.