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1、Chapter7TrafficandSafetyControlDevicesA.GeneralTrafficSigns,Marking,andSignal-Signs-Markings-Signals-ExamplePurposeofTrafficControlDevices-Thepurposeoftrafficcontroldevicesistopromotehighwaysafetyandefficiencybyprovidingfortheorderlymovementofallroadusersonstreets
2、andhighwaysthroughoutthenation.-Trafficcontroldevicesnotifyroadusersofregulationsandprovidewarningandguidanceneededforthesafe,uniform,andefficientoperationofallelementsofthetrafficstream.-Trafficcontroldevicesortheirsupportsshallnotbearanyadvertisingmessageoranyot
3、hermessagethatisnotrelatedtotrafficcontrol.3.PrinciplesofTrafficControlDevices-Guidance:Tobeeffective,atrafficcontroldeviceshouldmeetfivebasicrequirements:-Fulfillaneed,-Commandattention,-Conveyaclear,simplemeaning,-Commandrespectfromroadusers,and-Giveadequatetime
4、forproperresponse.4.DesignofTrafficControlDevices-Devicesshouldbedesignedsothatfeaturessuchassize,shape,andcolor,composition,lightingorretroreflection,andcontrastarecombinedtodrawattentiontothedevices;thatsize,shape,color,andsimplicityofmessagecombinetoproduceacle
5、armeaning;thatlegibilityandsizecombinewithplacementtopermitadequatetimeforresponse;andthatuniformity,size,legibility,andreasonablenessofthemessagecombinetocommandrespect.5.PlacementandOperationofTrafficControlDevices-Placementofatrafficcontroldeviceshouldbewithint
6、heroaduser’sviewsothatmaximumvisualacuityisprovided.Toaidinconveyingthepropermeaning,thetrafficcontroldeviceshouldbeappropriatelypositionedwithrespecttothelocation,object,orsituationtowhichitapplies.Thelocationandlegibilityofthetrafficcontroldeviceshouldbesuchthat
7、aroaduserhasadequatetimetomaketheproperresponseinbothdayandnightconditions.-Trafficcontroldevicesshouldbeplacedandoperatedinauniformandconsistentmanner.-Unnecessarytrafficcontroldevicesshouldberemoved.6.MaintenanceofTrafficControlDevices-Trafficcontroldevicesshoul
8、dbereviewedperiodicallytodetermineiftheymeetcurrenttrafficconditions.-Trafficcontroldevicesshouldbemaintainedtoensurethatlegibilityisretained,thatthedev
