... Bicycles will be able to pass either on the left or right on roads with pedestrian walkways with road traffic signs indicating "Bicycleable," or on roads where pedestrian and bicycle passages are separated by color pavements...bicycles will in principle be prohibited from passing on pedestrian walkways without "Bicycleable" signs, with exceptions...Mainichi.jp/english | 2013May13:
Keep-to-the-left rule for bicycles key in draft revision to Road Traffic Law
交通戦争 -- 自転車通行可 mainichi.jp/opinion/news/20130513
....the complexity, the provisions of the Road Traffic Law itself is ambiguous, and has prevented a thorough deep-rooted rules. There are exceptions of many in the passage way of the bicycle...