Custom is observed as law.

Explanation

Courts are bound to recognize and enforce customs that meet the requirements of certainty, reasonableness, and long use.

Where this applies

• A court refuses to recognize a well-established custom.
• A party ignores a longstanding local practice and claims it has no legal force.

See also

• 1.2.2 The general custom of the whole country is the common law of the country.
• 1.3.2 Custom is another law.