No one under eighteen

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