barricade barricades communicate flash flashing light lights orange street street sign warn warning white computer message computer warning screen message screen warning Spyware detected spyware message spyware removal spyware warning bricks floor information sign wet yellow cutout isolated border descent exclamation red road steep triangle beware cause comment pipe swim table tablet danger deep instruction lake pond swimming water black construction erection protection scaffold scaffolding warning sign careful signs train.trains transport warnings blue car carpark cars child safety child safety warning sign children dehydration exhaustion heat heat stroke motor car motor vehicle safety vehicle