We had more reservations about driving in Japan than we've had in any other country, with the possible exception of the first time we drove in London. We're here to tell you that our fears were warrantless. We had no idea what to expect, in terms of road signs, traffic density, or driver behaviors. We didn't know anyone who had driven there, and in our planning stages, when we mentioned that we were renting a car, we'd often get surprised looks or comments. Having done it, we'd wholeheartedly recommend it--we would have missed out on not just sights and areas, but an entire aspect of Japanese culture if we'd stuck to public transit. Don't get us wrong, the public transit was awesome, and we used it extensively, but driving in Japan was also pretty incredible.