治安

1. Origins, structure, and basic meaning

• Structure: 治安(ちあん) is the condition of public order that allows people to live securely.
• Basic usage: It describes a neighborhood's public safety or the maintenance of order during an event.

2. Common pitfalls and similar expressions

• The scope of safety
  • 安全 broadly means being free from danger; 治安 concerns safety in relation to crime and public order.
• Common combinations
  • 治安がよい means public safety is good; 治安の維持 means maintaining public order.