walkway marked with yellow sidewalk with beware of slippery floors signs at the way up and down the escalator

transport vehicle machine train room iron clothing track person metro passenger factory floor slippery escalator safety icon yellow wet lobby plastic clean danger modern symbol corridor hotel risk mop business ceiling staircase transportation cleaning empty cement uneven station subway broken equipment red city travel advice automated crash dubai futuristic hospital hygiene label law people pedestrian text boardwalk concrete fence footbridge road architecture walkway marked sidewalk beware floors signs ramathibodi bangkok