Public Order
Public Safety, Public Peace
noun
If your people can relax because you rule over them so well, there is public order. You don't want the people you rule being upset or stressed out, you want public safety and public peace for all!
ちあん
This is a jukugo word that uses the on'yomi readings of the kanji. You should be able to read this on your own.
この辺りは治安も悪くないけど、あの辺りは治安が良くないからね。
This area doesn’t have bad public safety, but that area does.
ビエトの親分は、治安ぼうがいでたいほされた。
Viet's boss was arrested for disturbing the peace.
こないだ、酔っ払ったコウイチが、「俺は実はスーパーマンなんだ。この辺りの治安を守っているのはこの俺様なんだ」って豪語していたよ。
The other day I saw Koichi, drunk, boastfully telling people that he's actually Superman and he's the one who keeps the peace around here.