No one under eighteen

☣ biohazard ⚠ warning ☢️ radioactive ☣️ biohazard 📵 no mobile phones ☢ radioactive 🚳 no bicycles 🚭 no smoking ⚠️ warning 🚯 no littering 🚸 children crossing 🚫 prohibited ⛔ no entry 🚱 non-potable water 🚷 no pedestrians