The measure is aimed at reducing accidents in urban areas with heavy pedestrian traffic and narrow streets, marking a major shift in the country’s traffic rules as these roads account for around 70% of all ordinary roads nationwide.
[…] above [30 kph] the risk of pedestrians suffering fatal injuries in accidents is said to spike.
[…]
The aim of the speed limit change “is to prevent accidents by stopping dangerous driving, such as failing to slow down even on busy streets”
Well the USA is one jurisdiction Japan is another jurisdiction and there are many other jurisdictions so again depending on the jurisdiction it could depend on whether you’re an asshole or not by asking this type of question.
I assumed you brought up US because there was some sort of direct example that explains the effects of this change or something.