No mobile phones

☣ biohazard ⚠ warning ☢️ radioactive ⚠️ warning ☣️ biohazard ☢ radioactive 🚳 no bicycles 🚫 prohibited 🚭 no smoking 🚯 no littering 🚸 children crossing ⛔ no entry 🚱 non-potable water 🚷 no pedestrians 🔞 no one under eighteen