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!
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.
このまま日本の少子化が進むと、治安も悪化するでしょう。
If Japan's birthrate continues to decline, public safety will worsen.
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ぜ。
I'm actually Superman and I'm the one who keeps the peace around here.