 Japanese makers who, despite heavy manufacturing presence in North America, still assemble most North America-bound luxury and sports models in Japan, have yet to initiate a similar program.A theoretical program would probably face increased difficulty because, while not illegal to operate in Japan, vehicles for the North American market have their steering wheels on the opposite side of vehicles designed for the Japanese market, which would make operation somewhat more difficult.Another factor is the complications of registering a vehicle in Japan due to anti-congestion laws and severe traffic in Japan's major cities.