How to say “That safety sign explains how to open the emergency door.” in Japanese

In Japanese

その安全標識(あんぜんひょうしき)に、非常口(ひじょうぐち)の開(あ)け方(かた)が書(か)いてあるよ。

Sono anzen hyōshiki ni, hijōguchi no akekata ga kaite aru yo.