swim forbidden sign

swim forbidden sign no swimming warning safety caution danger water hazard restricted area public notice prohibition alert rule instruction safety measure water safety lake river pool ocean beach restricted zone danger warning sign hazard symbol precaution advisory notice rule enforcement public safety water hazard sign danger alert swimming prohibited safety instruction cautionary notice restricted access water area safety guideline safety regulation warning poster protective measure alert signage water danger hazard advisory safety compliance rule sign swimming restriction caution sign safety notice restricted swimming area emergency warning instruction water safety guideline