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
Cycling in the Netherlands standard color to identify bike paths and on-road bike lanes in the Netherlands: either red asphalt or brickwork is used to visually distinguish cycle ways from car lanes and footpaths. Standard black asphalt is also commonly used and some older cycle paths are made of the square tiles commonly used for sidewalks. On-road bike lanes in the Netherlands are marked by either a dashed line or a solid line: lanes marked by a dashed line may be used by motorists provided that they do not impede cyclists, while those marked with a solid line may not be used by motorists.