No one under eighteen

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