Certain types of rules or customs may become [[law]] and regulatory legislation may be introduced to formalise or enforce the [[convention]] (e.g. laws which determine which side of the road vehicles must be driven). In a social [[context]], a convention may retain the [[character]] of an "unwritten" law of custom (e.g. the [[manner]] in which people greet each other, such as by shaking each other's hands). | Certain types of rules or customs may become [[law]] and regulatory legislation may be introduced to formalise or enforce the [[convention]] (e.g. laws which determine which side of the road vehicles must be driven). In a social [[context]], a convention may retain the [[character]] of an "unwritten" law of custom (e.g. the [[manner]] in which people greet each other, such as by shaking each other's hands). |