The growing popularity of rideable suitcases with electric motors designed to get people quickly around airports and train stations has alarmed Japanese authorities following a rise in incidents of foreign visitors using them illegally on public roads. Japan currently classifies electric suitcases, which are particularly popular in the rest of Asia, as motorized vehicles that can be ridden on roads only with the required safety equipment and a driver’s license. Two major Japanese airports have already asked travelers not to ride them within their facilities while police are urging domestic ret…