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ROADSINHERTFORDSHIREHIGHWAYDESIGNGUIDE3RDEDITIONVOLUME4DESIGNSTANDARDSANDADVICECHAPTER7ROADRESTRAINTSYSTEMS7ROADRESTRAINTSYSTEMSVEHICLEANDPEDESTRIAN11VEHICLERESTRAINTSYSTEMSVRS212PEDESTRIANRESTRAINTSYSTEMS3121PEDESTRIANCROSSINGS3122PEDESTRIANPARAPETS3123PEDESTRIANRESTRAINTANDPROTECTIONATHEADWALLS,WINGWALLSANDRETAININGWALLS471VEHICLERESTRAINTSYSTEMSVRSREFERTOSECTION5,CHAPTER5ROADRESTRAINTSYSTEMSVEHICLEANDPEDESTRIANSERIES400VEHICLERESTRAINTSYSTEMSVRSARESYSTEMSINSTALLEDONAROADTOPROVIDEALEVELOFCONTAINMENTFORERRANTVEHICLESTHEYWILLNOTNORMALLYBEREQUIREDONSINGLECARRIAGEWAYROADSWITHSPEEDLIMITSLESSTHAN50MPHTHEREMAY,HOWEVER,BECIRCUMSTANCESWHEREPROTECTIONISREQUIREDTOPREVENTLARGEVEHICLESFROMCOLLIDINGWITHSTRUCTURESTHEREMAYALSOBEASPECIFICNEEDTOPROVIDEPROTECTIONWHEREAHAZARDSUCHASARIVER,ROAD,RAILWAYORPEDESTRIANSUBWAYPASSESUNDERNEATHTHEROADSEEALSOTD19CHAPTER3FORTHEGENERALREQUIREMENTS,INCLUDINGVISIBILITY,SETBACK,WORKINGWIDTHCLASSANDLISTSOFHAZARDSFORCONSIDERATIONOFPROTECTIONFORTHESECIRCUMSTANCES,ARISKASSESSMENTSHOULDBECARRIEDOUTUSINGTHEGUIDANCEGIVENINTD19PARA123FORROADSWITHSPEEDLIMITSOFLESSTHAN50MPHWHEREVRSARETOBEPROVIDEDONROADSWHERETHESPEEDLIMITIS50MPHORHIGHER,THENTHEYSHALLCONFORMTOTHEREQUIREMENTSINTD19DMRB228TD19ISNOWARISKBASEDSTANDARDANDDOESNOTFOLLOWTHECONVENTIONALSTANDARDFORMATTHESTANDARDHASTWOPARTSTHATMUSTBEUSEDTOGETHER,NAMELYTHEWRITTENSTANDARDTD19REQUIREMENTFORRRSDMRB228ANDTHEROADRESTRAINTRISKASSESSMENTPROCESSRRRAP,WHICHISSOFTWAREDRIVENTHISSOFTWAREISAVAILABLEFROMWWWHIGHWAYSGOVUKANDISLOCATEDIN“DOINGBUSINESSWITHUS/TECHNICALINFORMATION”ROADFURNITUREMUSTNOTBEPOSITIONEDINFRONTOFANEWOREXISTINGVRSAND,INGENERAL,ITSHOULDNOTBEPLACEDIMMEDIATELYINADVANCEOFNORWITHINTHEAVAILABLEWORKINGWIDTHOFANEWOREXISTINGVRSUNLESSTHEROADFURNITUREHASBEENDESIGNEDTOBEPASSIVELYSAFE,ANDIFHIT,WILLNOTBEDISPLACEDINTOTHEADJACENTCARRIAGEWAYORGIVERISETOASECONDARYEVENTREFERTOTD19PARAS3123TO3128FORUSEOFPASSIVELYSAFELIGHTINGCOLUMNSANDSIGNSTHEREMAYBECIRCUMSTANCESWHEREDUETOPHYSICALGEOMETRICRESTRAINTS,AVRSCANNOTBEACCOMMODATEDWITHINTHETD19STANDARDFORROADSWITHSPEEDSOFGREATERTHAN50MPHRELAXATIONSMAYBEINTRODUCEDATTHEDISCRETIONOFHCC,HAVINGREGARDTOADVICEANDGUIDANCEGIVENINTD19ANDALLRELEVANTLOCALFACTORSCAREFULCONSIDERATIONMUSTBEGIVENTOLAYOUTOPTIONSANDTHEEFFECTSOFINCORPORATINGRELAXATIONS,HAVINGWEIGHEDTHEBENEFITSANDPOTENTIALDISADVANTAGESTHEPREFERREDOPTIONMUSTBECOMPAREDAGAINSTOPTIONSTHATWOULDMEETFULLSTANDARDSITISRECOMMENDEDTHATTHEDETAILSOFTHERELAXATIONANDJUSTIFICATIONARECOPIEDTOHCCBEFOREINCORPORATIONINTOTHEWORKS,SEETD19PARAGRAPHS137AND138WHERESPECIALCIRCUMSTANCESARISEANDTHETECHNICALREQUIREMENTSFORPROVISIONOFAVRSCANNOTBEACHIEVEDFORSOMEREASON,USERSAREENCOURAGEDTOCOMEFORWARDWITHDEPARTURESWHICHGOBEYONDRELAXATIONSFROMCRITERIA,ORTOPROPOSEADDITIONALCRITERIABASEDONAREASONEDASSESSMENTDETAILSOFTHEDEPARTUREANDJUSTIFICATIONSHOULDBECOPIEDTOHCCINORDERFORTHEPROPOSALSTOBEASSESSED,SEETD19PARAGRAPHS139AND140WHEREACONTRACTORNEEDSTOUSEAVRSASPARTOFTEMPORARYTRAFFICMANAGEMENT,THENITSHALLCONFORMTOTHEREQUIREMENTSGIVENINTD19CHAPTER8ROADSAFETYAUDITSMUSTBEUNDERTAKENONALLHIGHWAYSCHEMESINVOLVINGREMOVAL,PROVISIONORIMPROVEMENTOFVRSINACCORDANCEWITHHD19DMRB52272PEDESTRIANRESTRAINTSYSTEMSREFERENCESHOULDBEMADETOCHAPTER9OFTD19FORFURTHERGUIDANCEONPEDESTRIANRESTRAINTSYSTEMS721PEDESTRIANCROSSINGSTHEMINIMUMHEIGHTOFPEDESTRIANGUARDRAILORPEDESTRIANPARAPETMUSTBEASSHOWNINTABLE4721PARAPETSDROPSOVER12MUSERSGUARDRAILNOTOVERRAILWAYOVERRAILWAYPEDESTRIAN10M115M15MCYCLIST10M14M15MEQUESTRIAN18M18M18MTABLE4721MINIMUMGUARDRAILORPARAPETHEIGHTSREFERENCESHOULDBEMADETOCHAPTER4OFTD19FORACCEPTEDHEIGHTSOFPARAPETSANDCHAPTER9OFTD19FORINFORMATIONONPEDESTRIANRESTRAINTSYSTEMSMANYACCIDENTSATPEDESTRIANCROSSINGSOCCURONTHEAPPROACHTOTHECROSSINGTHEPROVISIONOFPEDESTRIANGUARDRAILINGATSUCHPOSITIONSSHOULDBECONSIDEREDHOWEVER,THEREISAGROWINGREALISATIONTHATTHEEXCESSIVEUSEOFSUCHFEATURESHASCAUSEDSUBSTANTIALAESTHETICDAMAGETOOURTOWNSANDCITIESASWELLASBEINGADETERRENTTOWALKINGANDAPOTENTIALHAZARDTOCYCLISTSHIGHINTERVISIBILITYPEDESTRIANGUARDRAILINGMAYBEREQUIREDTOGIVEMOTORISTSACLEARVIEWOFWAITINGPEDESTRIANSTHEAPPROPRIATETYPEGUARDRAILINGWILLDEPENDONTHEGEOMETRICLAYOUTOFTHECROSSINGFACILITY,SEEMANUFACTURERSDETAILSFORTHEVARIOUSTYPESOFGUARDRAILINGTOBEUSEDINDIFFERENTSCENARIOS,BEITONASTRAIGHTROADORONABENDTHEEFFECTIVENESSOFGUARDRAILINGISLESSENEDIFGAPSHAVETOBELEFTFORACCESSFORVEHICLESANDTHELOADINGANDUNLOADINGOFGOODSWHEREPOSSIBLE,CROSSINGSSHOULDBESITEDTOAVOIDTHENECESSITYFORSUCHGAPSPEDESTRIANGUARDRAILINGATTRAFFICSIGNALCONTROLLEDCROSSINGSSHOULDSTARTATTHESIGNALPOSTBUTNOTENCROACHBEYONDTHEPUSHBUTTONPOSITIONITISDESIRABLEINSOMECASESTORESTRICTTHECROSSINGOFPEDESTRIANSTOCERTAINAPPROACHESTHISMAYBETHECASEATATRAFFICSIGNALCONTROLLEDJUNCTIONORWHEREACHANGEINDIRECTIONISREQUIREDACROSSANISLANDSUCHASAROUNDABOUTPEDESTRIANGUARDRAILSCANBEUSEDTOPREVENTPEDESTRIANSCROSSINGATDANGEROUSPLACESFOREXAMPLEWHEREFILTERINGTRAFFICMAYBEMOVINGATTIMESUNEXPECTEDBYPEDESTRIANSPEDESTRIANGUARDRAILSSHOULDNOTBEPROVIDEDASADETERRENTTOKERBSIDEVEHICLEPARKING722PEDESTRIANPARAPETSALLFOOTBRIDGESANDBRIDLEWAYBRIDGESMUSTBEPROVIDEDWITHPEDESTRIANPARAPETSCONFORMINGTOTHEREQUIREMENTSOFBS7818PEDESTRIANPARAPETSONBRIDGESOVERRAILWAYSARESUBJECTTOSPECIALDESIGNREQUIREMENTSWITHRESPECTTOINFILLPANELS,ASDETAILEDINBS7818ANDTHEDESIGNANDMATERIALMUSTBEAPPROVEDBYTHERAILWAYAUTHORITYONCYCLEWAYBRIDGESORACCOMMODATIONBRIDGESFREQUENTLYUSEDBYEQUESTRIANS,THEHEIGHTOFTHEPARAPETABOVETHEADJOININGPAVEDSURFACEMUSTBEINCREASEDTO18M,ANDA600MMHIGHSOLIDINFILLPANELMUSTBEPROVIDEDATTHEBOTTOMOFTHEPARAPETINORDERTOOBSTRUCTTHEANIMALSVIEWOFTHEROADBELOW723PEDESTRIANRESTRAINTANDPROTECTIONATHEADWALLS,WINGWALLSANDRETAININGWALLSWHEREANYPEDESTRIANMOVEMENTMAYOCCURWITHINTHEHIGHWAYFROMUSEORMAINTENANCEOFTHEHIGHWAYANDTHEREISARISKTOHEALTHANDSAFETYFROMAFALLFROMAHEIGHT,SUITABLEPROTECTIVEMEASURESMUSTBEPROVIDEDINACCORDANCEWITHTHEREQUIREMENTSDETAILEDBELOWWHEREASTRUCTURE,SUCHASARETAININGWALL,HEADWA
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