Overhead guide sign retroreflectivity and illumination : [technical summary].

PDFBriefK-TRAN: KSU-11-6Overhead traffic signsRetroreflectivityVisibilityEnergy conservationCostsLightingSurveysState departments of transportationField testsLaboratory testsRecommendationsKansasKansas. Dept. of TransportationObeidat, MohammedRys, MalgorzataRussell, Eugene R.Kansas State University. Transportation CenterUS Transportation CollectionCompared to daylight driving, nighttime driving is more demanding because of visibilityissues, such as a driver\ue2\u20ac\u2122s visual acuity, contrast sensitivity, distance judgment, andcolor discrimination. Overhead highway signs are very important for enhancing driverguidance. The objective of these signs is to provide roadway drivers with informationregarding destinations and other driving maneuvers required to safely reach specificdestinations