danger from oil slick: warning sign on the side of the road

warninglabel warningindicator warningboard warning vehicle unsafezone unsafe transportation traffic street spill slick sign side safety roadside roadmarking road publicsafety public protective protection precautions precautionary precaution pollution oilwaste oilspillwarning oilspill oilpollution oil industry hazard environmentalist environmentalimpact environmental environment emergency eco danger contamination conservation climate cleanup chemical alertsign alert accident