No one under eighteen

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