If you want to get a good idea of what it is like driving in Japan then the Youtube channel below gives you a good idea. Whole routes are filmed and speeded up to give you an excellent idea of Japanese road conditions, traffic and the surrounding countryside and cityscapes.
Each of the over 400 routes on the drivemovie channel comes complete with a google map and a route broken down into sections. This Hamada in Shimane Prefecture on the Japan Sea coast to Hiroshima on the Pacific coast is a favorite.
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