Convention (norm) States and in Germany that motorists drive on the right side of the road, whereas in New Zealand and the United Kingdom motorists drive on the left. The standardization of time is a human convention based on the solar cycle or calendar. The extent to which justice is conventional (as opposed to natural or objective) is historically an important debate among philosophers. The nature of conventions has raised long-lasting philosophical discussion. Quine, Davidson, and David Lewis published influential writings on the subject. Lewis's account of convention received an extended critique in Margaret Gilbert's "On Social Facts" (1989), where an alternative
Road signs in Japan maintain the inverted triangular shape. Road signs in Japan In Japan, are standardized by the "" established on 1968 whose origins are Tokyo Metropolitan Police Department's "Order on Standardization of Road Sign" on 1934 and Home Ministry of Japan's "Order on Road Signs" on 1942. The previous designs have been used since 1986 after several amendments of order. They are divided into and . are categorized into 4 types; guide, warning, regulatory and instruction signs. indicates directions or distances of the road. Guide signs have dark green backgrounds and white text for expressways. In urban areas and on national highways,