<P> Sea fog or "fret" encroaching on Brighton Pier </P> <Li> <P> Sea fog in the Arctic Ocean near the island of Jan Mayen </P> </Li> <P> Sea fog in the Arctic Ocean near the island of Jan Mayen </P> <P> Depending on the concentration of the droplets, visibility in fog can range from the appearance of haze, to almost zero visibility . Many lives are lost each year worldwide from accidents involving fog conditions on the highways, including multiple - vehicle collisions . </P>

The low point or valley of a wave is called the