No one under eighteen

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