規制

1. Origins, structure, and basic meaning

• Structure: 規制 (きせい) means limiting conduct or scope by rule. 規制した enacts a restriction; nominal 規制について makes the regulation a topic of explanation.
• Basic usage: One context restricts vehicle traffic to reduce noise, and the other explains the contents of a new regulation.

2. Common pitfalls and similar expressions

• Restriction enacted and rule explained
  • The verbal form requires the restricted target 車の通行を; the nominal form uses について to set the discussion topic. Keep its spelling distinct from homophone 帰省.