Kei cars don't have the crash safety required for US roads, speeds and the traffic they need to share the roads with. A crash between a Kei and a US truck at 55 mph would be a bloodbath.
Keis work in Japan because the average speed is much lower and you're more likely to get into an accident with another kei.
Keis work in Japan because the average speed is much lower and you're more likely to get into an accident with another kei.