1993 GMC Suburban Owner's Manual - Page 204

Whatyoudo in thedaytimecanalsoaffectyournightvision.Forexample, if youspendtheday in brightsunshineyouarewise to wearsunglasses. Your eyeswillhavelesstroubleadjusting to night. But if you'redriving,don'twearsunglassesatnight.Theymay cut downon glarefromheadlights, but theyalsomakealotofthingsinvisible that should remainvisible-suchasparkedcars,obstacles,pedestrians,oreventrains blockingrailwaycrossings. Youmaywant to putonyoursunglassesafteryou have pulled intoabrightly-lightedservice or refreshmentarea.Eyesshielded fromthatglaremayadjustmorequicklytodarknessback on theroad.But be suretoremoveyoursunglassesbeforeyouleavethesetvicearea. You can betemporarily blinded by approachinglights. It cantakeasecondor two,orevenseveralseconds,foryoureyes to readjusttothedark.When youarefacedwith Severe glare(asfromadriver whodoesn'tlowerthe high beams,oravehiclewithmisaimedheadlights),slowdownalittle.Avoid If there is aline of opposing staringdirectlyintotheapproachinglights. traffic,makeoccasionalglancesovertheline of headlightstomake certain thatone of thevehiclesisn'tstarting to moveintoyourlane.Once you are pastthebrightlights,giveyoureyestimetoreadjustbeforeresumingspeed. If thevehicleapproaching you has itshighbeamson,signalbyflickingyours to high andthenback to lowbeam.This is theusualsignal to lowerthe headlightbeams. If the otherdriver still doesn'tlowerthebeams,resistthe temptationtoputyour high beamson.Thisonlymakestwohalf-blinded drivers. On afreeway,useyour high beamsonly in remoteareaswhere you won't impairapproachingdrivers. In someplaces,likecities,usinghighbeams is illegal. Whenyoufollowanothervehicleonafreewayorhighway, use lowbeams. True,mostvehiclesnowhaveday-nightmirrorsthatenablethedriver to reduceglare.Butoutsidemirrorsarenotofthistypeand high beamsfrom behindcanbotherthedriverahead. A Few More Night Driving Suggestions Keep your windshieldandalltheglass on yourvehicleclean-insideandout. Glareatnightismademuchworsebydirtontheglass.Eventheinside of theglasscanbuildupafilmcausedbydust.Tobaccosmokealsomakes inside glasssurfacesveryfilmyandcan be avisionhazard if it'sleftthere. Dirtyglassmakeslightsdazzle and flashmore than cleanglasswould, makingthepupils ofyoureyescontractrepeatedly. You mightevenwant to