No one under eighteen

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