1993 Chevrolet Suburban Owner's Manual - Page 207
1993 Chevrolet Suburban Manual
Page 207 highlights
Your Driving and the Road ~~ ~ Driving in Fog, Mist and Haze 1 AN459006 Fogcanoccurwithhighhumidityorheavyfrost.Itcanbe so mildthatyou it mightbe so thick canseethroughitforseveralhundredfeet(meters).Or thatyoucanseeonlyafewfeet(meters)ahead.Itmaycomesuddenly to anotherwiseclearroad.And it canbeamajorhazard. Whenyoudriveintoafogpatch,yourvisibilitywillbereducedquickly.The biggestdangersarestrikingthevehicleaheadorbeingstruckbytheone behind.Tryto "read"thefogdensity downtheroad.Ifthevehicleahead starts to becomelessclear or, atnight, if thetaillightsarehardertosee,the fog is probablythickening.Slowdowntogivetrafficbehindyouachance to slowdown.Everybodythenhasabetterchance to avoid hitting the vehicle ahead. A patch of densefogmayextendonly for a fewfeet(meters)orformiles (kilometers);youcan'treally tell whileyou're in it. You canonlytreatthe situationwithextremecare. Onecommonfogcondition-sometimes called mistorgroundfog-can happen in weather that seemsperfect,especiallyatnightor in theearly morning in valleyandlow,marshyareas.You can besuddenlyenvelopedin thick, wethazethatmayevencoatyourwindshield.Youcanoftenspotthese fogpatches or mistlayerswithyourheadlights.Butsometimestheycanbe or dipintoashallow valley. Start waiting for you asyoucomeoverahill your windshieldwipersandwashertohelpclearaccumulatedroaddirt.Slow downcarefully. 4-40