I remember driving in Germany, with fog so thick I could not see 10 feet and looking up seeing stars.
So once I was driving on a winding back road in Mass. and a soupy fog quickly set in. Suddenly, I realized I was driving by about sixty bicyclists on the side of the road! I stopped and screamed for them to get off the road! No one can see you! Only grace saved them from being run over! It took a while for me to get my never up to creep on home.