As I go to Japan to look at, ride on and photograph the trains I do not seem to have really have picked up much knowledge about the road systems there apart from the obvious one that they are driving on the "right" side of the road

What roadmarkings do they have at intersections and what are the "diamond" shapes painted on the roads at various points for? Also the lines down the middle of the roads - just dashes/single/double solid line combinations as in the EU or is there anything special to Japan roads?