special measures law
A law enacted to address a specific, often temporary, situation or policy goal, typically with provisions that differ from standard legislation.
The government enacted a special measures law for infectious disease control.
This special measures law was created to accelerate disaster recovery.
法律 is a general term for any law or statute, while 特別措置法 refers specifically to a law with special, often temporary, measures.
措置法 is a broader category of laws that establish measures; 特別措置法 emphasizes the special or extraordinary nature of the measures.
Compound of 特別 (special) + 措置 (measures) + 法 (law). A straightforward modern legal term.