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Safety and security (H)
    Safety (Ha)
         Use For: Public safety; Safety measures
        Transportation safety (Haa)
             Related Term (Associative): ; Safety culture (Cos); Safety analysis (Hasa)
            Aviation safety (Haaa)
                 Use For: Flight safety
                 Related Term (Associative): Cockpit resource management (Brcc)
            Marine safety (Haam)
                Maritime safety (Haamm)
            Pipeline safety (Haap)
                 Use For: Pipeline accidents; Pipeline incidents
            Railroad safety (Haar)
            Traffic safety (Haat)
                 Related Term (Associative): ; Traffic conflicts (Bthc)
                Highway safety (Haath)
                     Use For: Road safety
                    Work zone safety (Haathw)
                         Related Term (Associative): Shadow vehicles (Qtpbmq)
                Trucking safety (Haatk)
            Transit safety (Haau)
            Vehicle safety (Haav)
                 Related Term (Associative): ; Vehicle operations (Br); Occupant protection devices (Qpq)
                Escape systems (Haava)
                Fleet safety (Haavf)
                Recall campaigns (Haavr)
                Vehicle fitness (Haavs)
                     Related Term (Associative): 
                    Airworthiness (Haavsf)
                    Crashworthiness (Haavsg)
                    Seaworthiness (Haavsh)
            Pedestrian safety (Haaw)
        Construction safety (Hac)
        Product safety (Hap)
        Occupational safety (Haq)
             Use For: Worker safety
             Related Term (Associative): ; Industrial hygiene (Ccbkyi); Safety culture (Cos); Industrial accidents (Haqi)
            Industrial accidents (Haqi)
                 Use For: Occupational accidents; Workplace accidents
                 Related Term (Associative): Occupational safety (Haq)
        School safety (Har)
            School patrols (Harp)
        Safety factors (Has)
            Safety analysis (Hasa)
                 Related Term (Associative): Transportation safety (Haa); Safety audits (Hawa); Risk assessment (Hka)
            Legibility (Hasm)
            Visibility (Hasv)
                 Use For: Conspicuity
                 Related Term (Associative): 
                Blind spots (Hasvb)
                     Related Term (Associative): 
                Visibility distance (Hasvd)
                     Use For: Site distance
                Night visibility (Hasvn)
        Safety engineering (Hau)
            Fail safe systems (Hauf)
            System safety (Haus)
        Safety programs (Haw)
            Safety audits (Hawa)
                 Related Term (Associative): Auditing (Cad); Safety analysis (Hasa)
            Safety campaigns (Hawc)
                 Related Term (Associative): 
            Safety management (Hawm)
            Safety propaganda (Hawp)
                 Related Term (Associative): Promotion (Cjp)
            Safety education (Hawt)
                 Related Term (Associative): Education and training (Ce)
                Traffic safety education (Hawtt)
                     Related Term (Associative): Education and training (Ce)
                    Driver education (Hawttd)
                         Use For: Driving schools
                        High school driving courses (Hawttdb)
                        Classroom driver instruction (Hawttdc)
                        Driver training (Hawttdt)
                             Use For: Behind the wheel instruction
                             Related Term (Associative): ; 
                        Driver rehabilitation (Hawttdu)
                             Use For: Rehabilitation (Drivers)
                        Driver improvement programs (Hawttdv)
                    Pedestrian education (Hawttp)
        Countermeasures (Hax)
    Crashes (Hb)
         Use For: Accidents; Collisions
         Related Term (Associative): ; Emergencies (Hhge)
        Crash types (Hbb)
             Use For: Accident types
             Related Term (Associative): 
            Air transportation crashes (Hbba)
                 Use For: Aircraft accidents; Aircraft collisions; Aircraft crashes; Airline accidents; Airline crashes; Aviation accidents; Aviation crashes
                 Related Term (Associative): Aircraft crash victims (Mswvab)
                Midair crashes (Hbbam)
                     Use For: Midair collisions
                Near midair crashes (Hbban)
                     Use For: Near midair collisions; Near misses
                     Related Term (Associative): Near crashes (Hbkn)
                Runway incursions (Hbbar)
                     Related Term (Associative): Airport surface traffic control (Dcmtbxc)
                Runway overruns (Hbbat)
            Ground transportation crashes (Hbbg)
                 Use For: Ground transportation accidents
                Animal vehicle crashes (Hbbga)
                     Use For: Animal vehicle collisions
                Bicycle crashes (Hbbgb)
                     Use For: Bicycle accidents; Cycling accidents; Cycling crashes
                Bus crashes (Hbbgc)
                     Use For: Bus accidents
                Moped crashes (Hbbgk)
                     Use For: Moped accidents
                Motorcycle crashes (Hbbgm)
                     Use For: Motorcycle accidents
                Pedestrian-vehicle crashes (Hbbgp)
                     Use For: Pedestrian accidents
                Railroad crashes (Hbbgr)
                     Use For: Railroad accidents
                    Derailments (Hbbgrd)
                Traffic crashes (Hbbgt)
                     Use For: Highway accidents; Highway crashes; Traffic accidents
                     Related Term (Associative): ; Traffic (Bt); Incident management (Dcmthcj); Traffic crash victims (Mswvat)
                    Single vehicle crashes (Hbbgta)
                         Use For: Single vehicle accidents
                         Related Term (Associative): 
                        Hit and run crashes (Hbbgtah)
                             Use For: Hit and run accidents
                             Related Term (Associative): 
                        Ran off road crashes (Hbbgtaj)
                             Use For: Ran off road accidents; Roadway departure accidents; Roadway departure crashes; Running off roadway
                             Related Term (Associative): 
                        Rollover crashes (Hbbgtat)
                             Use For: Rollover accidents
                             Related Term (Associative): Motor vehicle dynamics (Qdm); Overturning (Smfp); Stability (Mechanics) (Sms)
                    Multiple vehicle crashes (Hbbgtb)
                         Use For: Car truck accidents; Car truck crashes; Multiple car accidents; Multiple car crashes; Multiple vehicle accidents
                    Frontal crashes (Hbbgtf)
                         Use For: Front end collisions; Frontal collisions; Head on crashes
                         Related Term (Associative): ; 
                    Rear end crashes (Hbbgtr)
                         Use For: Rear end collisions
                         Related Term (Associative): 
                    Side crashes (Hbbgts)
                         Use For: Side collisions; Side impact collisions; Sideswipe collisions; Sideswiping accidents; Sideways collisions
                         Related Term (Associative): ; ; Side air bags (Qpqrpbs)
                        Right angle crashes (Hbbgtsa)
                             Use For: Right angle collisions
                    Underride override crashes (Hbbgtu)
                         Use For: Override underride crashes; Underride override collisions
                         Related Term (Associative): 
                    Secondary crashes (Hbbgtw)
                         Use For: Secondary collisions
                         Related Term (Associative): 
                Truck crashes (Hbbgu)
                     Use For: Truck accidents
                    Jackknifing (Hbbguj)
                Transit crashes (Hbbgw)
                     Use For: Transit accidents
            Water transportation crashes (Hbbm)
                 Use For: Marine accidents; Marine crashes; Maritime accidents; Maritime crashes; Ship collisions; Ship crashes
                Shipwrecks (Hbbma)
                Allisions (Hbbmc)
                Groundings (Maritime crashes) (Hbbmd)
                Capsizing (Hbbmt)
            Falls (Hbbw)
                 Use For: Slipping and falling accidents
        Crash causes (Hbc)
             Use For: Accident factors; Accident responsibility; Crash factors; Crash responsibility
             Related Term (Associative): 
            Human factors in crashes (Hbch)
                 Use For: Human factors in accidents
                Driver errors (Hbche)
                     Related Term (Associative): Steering (Dcnbsts)
                    Speeding (Hbchee)
                         Use For: Overspeed
                         Related Term (Associative): 
                    Oversteer (Hbcheg)
                    Understeer (Hbcheh)
                    Loss of control (Hbcheq)
                    Wrong way driving (Hbchew)
                Driver experience (Hbchg)
                     Related Term (Associative): 
                Sleep deprivation (Hbchs)
                     Related Term (Associative): Sleep (Mxbr)
            Vehicle factors in crashes (Hbcv)
                 Use For: Vehicle factors in accidents
                Hydroplaning (Hbcvh)
                Skidding (Hbcvs)
            Highway factors in crashes (Hbcw)
                 Use For: Highway factors in accidents
                 Related Term (Associative): Highway design (Esush)
        Crash characteristics (Hbk)
             Use For: Accident characteristics
            Crash severity (Hbkd)
                 Use For: Accident severity
                 Related Term (Associative): 
            Crash locations (Hbkg)
                 Use For: Accident locations
                High risk locations (Hbkga)
                     Use For: Accident black spots; Accident prone locations; High accident locations; Hot spots; Hotspots
                     Related Term (Associative): ; Risk (Hk)
                    Roadside hazards (Hbkgar)
            Near crashes (Hbkn)
                 Use For: Near accidents; Near miss collisions (Ground transportation)
                 Related Term (Associative): Near midair crashes (Hbban)
            Time of crashes (Hbkt)
                 Use For: Time of accidents
                Daytime crashes (Hbktd)
                     Use For: Daytime accidents
                Nighttime crashes (Hbktn)
                     Use For: Nighttime accidents
        Crash phases (Hbp)
            Precrash phase (Hbpb)
            Crash phase (Hbpk)
                Occupant vehicle interface (Hbpkc)
                    Occupant dynamics (Hbpkcd)
                        Ejection (Hbpkcde)
                    Occupant kinetics (Hbpkcn)
                         Use For: Human body kinetics
                Vehicle trajectories (Hbpkt)
            Postcrash phase (Hbpp)
                Debris removal (Hbppd)
                Survival (Hbpps)
                     Use For: Accident survivability; Crash survivability
                    Crash survival time (Hbppst)
                         Use For: Accident survival time
        Crash analysis (Hbw)
             Use For: Accident analysis
             Related Term (Associative): ; Crash modification factors (Usyfd)
        Crash investigation (Hbx)
             Use For: Accident investigation
             Related Term (Associative): 
            On the scene crash investigation (Hbxb)
                 Use For: On the scene accident investigation
                Crash investigation sites (Hbxbb)
                     Use For: Accident investigation sites
                    Skidmarks (Hbxbbs)
            Follow up investigation (Hbxf)
            Crash reconstruction (Hbxr)
                 Use For: Accident reconstruction; Reconstruction of accidents; Reconstruction of crashes
                 Related Term (Associative): 
                Crash diagrams (Hbxrd)
                     Use For: Accident diagrams; Collision diagrams
            Crash data (Hbxx)
                 Use For: Accident data
                Trilevel crash investigation (Hbxxk)
                     Use For: Trilevel accident investigation
                Crash records (Hbxxr)
                     Use For: Accident records
                     Related Term (Associative): 
                    Crash reports (Hbxxrr)
                         Use For: Accident reports
                Crash rates (Hbxxs)
                     Use For: Accident frequency; Accident rates; Crash frequency
                     Related Term (Associative): ; 
                    Crash risk forecasting (Hbxxsv)
                         Use For: Accident risk forecasting
                         Related Term (Associative): Risk assessment (Hka)
    Hazards and emergency operations (Hh)
         Use For: Emergency services
        Hazards (Hhd)
             Use For: Danger
             Related Term (Associative): ; Environmental risk assessment (Jfd)
            Hazard analysis (Hhda)
            Hazard evaluation (Hhde)
            Hazard mitigation (Hhdg)
                 Related Term (Associative): 
            Health hazards (Hhdh)
            Hazard markings (Hhdm)
        Disasters and emergency operations (Hhg)
            Disasters (Hhgd)
                Disaster preparedness (Hhgdb)
                     Use For: Emergency preparedness
                Disaster relief (Hhgdr)
                Disaster resilience (Hhgds)
            Emergencies (Hhge)
                 Related Term (Associative): Crashes (Hb)
                Emergency communication systems (Hhgec)
                     Use For: Emergency reporting systems
                     Related Term (Associative): Emergency transportation (Afs); Automatic crash notification (Dsfpcb)
                Emergency management (Hhgem)
                     Use For: Rapid response (Emergencies)
                     Related Term (Associative): Incident management (Dcmthcj)
            Lifelines (Hhgm)
            Search and rescue operations (Hhgr)
                Lifesaving (Hhgrm)
                Vehicle occupant rescue (Hhgrp)
                     Use For: Occupant rescue
                Emergency response time (Hhgrt)
            Evacuation (Hhgv)
                 Related Term (Associative): ; ; Emergency transportation (Afs)
        Radiation hazards (Hhr)
            Radiation doses (Hhrd)
                 Use For: Radiation dosage
            Radiation monitoring (Hhrm)
                 Related Term (Associative): Monitoring (Dmbm)
            Radiation shielding (Hhrs)
        Fires (Hhu)
            Fire causes (Hhua)
            Fire detection systems (Hhud)
                 Use For: Smoke detectors
            Fire fighting (Hhuf)
            Fire prevention (Hhup)
            Fires by type (Hhuy)
                Forest fires (Hhuyf)
                Vehicle fires (Hhuyv)
        Warning systems (Hhw)
    Injuries (Hj)
         Use For: Injury; Trauma
        Injury classification (Hjb)
        Injury causes (Hjc)
            Crash injuries (Hjcc)
                 Use For: Collision injuries
                 Related Term (Associative): Biodynamics (Tpdbd)
        Injury characteristics (Hjh)
            Casualties (Hjhc)
            Multiple injuries (Hjhm)
            Injury rates (Hjhr)
            Injury severity (Hjhs)
            Fatalities (Hjhx)
                 Use For: Death; Fatal accidents; Traffic fatalities
                Road kill (Hjhxr)
        Injury types (Hjp)
            Skin injuries (Hjpb)
                Abrasions (Hjpbb)
                Contusions (Hjpbc)
                Laceration (Hjpbf)
                Avulsions (Hjpbr)
            Amputations (Hjpc)
            Fractures (Anatomy) (Hjpd)
                Skull fractures (Hjpds)
            Dislocations (Hjpe)
                Whiplash (Hjpew)
            Burns (Injuries) (Hjpf)
            Crushing injuries (Hjpg)
            Open wounds (Hjpm)
            Penetrating injuries (Hjpp)
                 Use For: Perforations (Injuries); Punctures (Injuries)
            Traumatic brain injuries (Hjpt)
                 Use For: Concussion
            Internal injuries (Hjpv)
            Bleeding (Hjpw)
                 Use For: Hemorrhage
            Pathological processes (Hjpy)
                Asphyxia (Hjpya)
                    Drowning (Hjpyah)
                Hypothermia (Hjpyh)
        Crash injury research (Hjr)
             Use For: Collision injury research
             Related Term (Associative): Biodynamics (Tpdbd); Transportation medicine (Ttux)
            Impact tests (Hjrc)
                 Use For: Collision tests; Crash tests
                Sled tests (Hjrcs)
            Crash victim simulation (Hjrs)
                 Use For: Animals in crash research; Occupant modeling
                Dummies (Hjrsb)
                     Use For: Crash dummies; Manikins; Mannequins
                     Related Term (Associative): Anatomical models (Myx); Anthropometry (Tgcp)
    Risk (Hk)
         Related Term (Associative): High risk locations (Hbkga); High risk drivers (Mtghdfc)
        Risk assessment (Hka)
             Use For: Vulnerability assessment
             Related Term (Associative): Risk management (Cnb); Safety analysis (Hasa); Crash risk forecasting (Hbxxsv); Environmental risk assessment (Jfd)
        Crash exposure (Hke)
             Use For: Accident exposure
             Related Term (Associative): 
    Pathology (Hm)
        Diseases and medical conditions (Hmd)
             Use For: Illness; Medical conditions
             Related Term (Associative): Plant diseases (Fmuko); Physical disabilities (Mxc); Pathology (Ttup)
            Cardiovascular diseases (Hmdb)
                Apnea (Hmdbc)
                     Use For: Apnoea
                     Related Term (Associative): Sleep disorders (Mxbrd); Respiratory system (Myvr)
                Cardiac disorder (Hmdbh)
                     Use For: Heart diseases
                Shock (Pathology) (Hmdbs)
                Hypertension (Hmdbv)
            Occupational diseases (Hmdc)
            Communicable diseases (Hmdd)
                 Use For: Contagious diseases; Infectious diseases
                 Related Term (Associative): Epidemiology (Hmxp); Epidemiology (Ttud)
            Ear diseases (Hmde)
                Motion sickness (Hmdem)
                     Related Term (Associative): 
            Cancer (Hmdf)
                 Related Term (Associative): Carcinogens (Rbmdsb)
            Glandular diseases (Hmdg)
                Diabetes (Hmdgd)
                Obesity (Hmdgo)
                     Use For: Overweight persons
                     Related Term (Associative): Human body size (Mxbhs)
            Hypoxia (Hmdh)
            Nervous system diseases (Hmdn)
                Epilepsy (Hmdne)
                Narcolepsy (Hmdnn)
            Drug use (Hmdq)
                Drug abuse (Hmdqb)
                Drug addiction (Hmdqc)
                Drug effects (Hmdqe)
                     Related Term (Associative): 
                Smoking (Hmdqs)
                Drugs (Hmdqx)
                     Related Term (Associative): ; Medication (Hpgm)
                    Types of drugs (Hmdqxa)
                    Narcotics (Hmdqxd)
                        Barbiturates (Hmdqxdb)
                        Heroin (Hmdqxdh)
                    Hallucinogenic drugs (Hmdqxh)
                    Marijuana (Hmdqxm)
                         Use For: Marihuana
                    Stimulants (Hmdqxs)
                        Caffeine (Hmdqxsc)
                        Amphetamines (Hmdqxsh)
                        Cocaine (Hmdqxsk)
            Alcohol use (Hmds)
                 Use For: Alcohol consumption; Social drinking
                Legal drinking age (Hmdsa)
                Alcohol abuse (Hmdsb)
                Alcoholism (Hmdsd)
                     Use For: Alcoholics
                Alcohol effects (Hmdse)
                    Intoxication (Hmdsed)
                         Use For: Drunkenness
                        Drunk driving (Hmdsedd)
                             Use For: Driving under the influence; Driving while intoxicated; DUI; DWI
                             Related Term (Associative): Moving violations (Huvm); Alcohol ignition interlock devices (Qtbmbereqr)
                            Zero tolerance (Hmdseddy)
                    Hangover (Hmdseh)
                Alcoholic beverages (Hmdsu)
                Drinking establishments (Hmdsx)
                     Use For: Bars (Drinking establishments); Taverns
        Poisoning (Hme)
             Related Term (Associative): Poisons (Rbmdsp)
            Catalyst poisoning (Hmec)
        Diagnosis (Hms)
        Pathological data (Hmx)
            Epidemiology (Hmxp)
                 Related Term (Associative): Communicable diseases (Hmdd)
            Etiology (Hmxt)
    Medical services (Hp)
        Health care (Hpa)
             Use For: Medical care
        Emergency medical services (Hpe)
            First aid (Hpea)
            Air ambulance services (Hpef)
            Resuscitation (Hper)
        Medical treatment (Hpg)
            Anesthesia (Hpgf)
                 Use For: Anaesthesia
            Life support systems (Hpgh)
            Surgery (Hpgk)
            Medication (Hpgm)
                 Related Term (Associative): Drugs (Hmdqx); Pharmacology (Tphs)
                Dosage (Hpgmd)
                Antihistamines (Hpgmh)
                Psychotropic agents (Hpgmp)
                Sedatives (Hpgms)
                Tranquilizers (Hpgmt)
                Antidepressants (Hpgmu)
                Placebos (Hpgmx)
            Therapy (Hpgt)
                Behavior modification (Hpgtb)
                Psychotherapy (Hpgtp)
            Outcome (Medical treatment) (Hpgv)
                 Use For: Injury outcome
        Medical examinations and tests (Hpm)
            Blood analysis (Hpmb)
                Blood alcohol levels (Hpmba)
                     Use For: Alcohol in the body
                Blood carbon monoxide levels (Hpmbc)
                     Use For: Carbonmonoxyhemoglobin; Carboxyhemoglobin
            Cadavers (Hpmc)
            Electroencephalography (Hpme)
            Electrocardiography (Hpmk)
            Urinalysis (Hpmp)
                Urine alcohol levels (Hpmpa)
            Drug tests (Hpmt)
                 Use For: Drug testing
            Alcohol tests (Hpmw)
                 Use For: Intoxication tests; Sobriety tests
                 Related Term (Associative): 
                Alcohol blood tests (Hpmwb)
                Alcohol breath tests (Hpmwd)
                    Random breath tests (Hpmwdr)
                Alcohol chemical tests (Hpmwg)
            Autopsies (Hpmx)
            Disability evaluation (Hpmy)
        Medical records (Hpx)
            Medical case reports (Hpxc)
    Law enforcement (Hr)
         Related Term (Associative): Jurisprudence and judicial processes (Cs)
        Automated enforcement (Hra)
             Related Term (Associative): Cameras (Qtprc)
        Police powers (Hrb)
            Custody (Hrbc)
            Entrapment (Hrbe)
            Search and seizure (Hrbs)
        Police operations (Hrk)
            Warnings (Police operations) (Hrkb)
            Warrants (Police operations) (Hrkf)
            Interrogation (Hrkg)
            Police pursuit driving (Hrkj)
            Arrests (Hrkk)
            Police patrol (Hrkp)
            Roadblocks (Hrkr)
            Police traffic services (Hrkt)
                Traffic patrol (Hrktb)
                Sobriety checkpoints (Hrktc)
                Traffic law enforcement (Hrkte)
                    Traffic citations (Hrktec)
                    Traffic arrests (Hrktek)
                    Traffic conviction (Hrkteq)
                Police traffic direction (Hrktg)
                Police motorist contacts (Hrktm)
                Traffic ticket systems (Hrktt)
                    Point demerit systems (Hrkttd)
                         Related Term (Associative): Driver licenses (Crhym)
        Prosecution (Hrp)
        Police reports (Hrx)
    Security (Hs)
         Use For: Security measures
         Related Term (Associative): 
        Prevention (Hsa)
        Protection (Hsb)
        Security checkpoints (Hsc)
             Related Term (Associative): Baggage screening (Bdkbs); Passenger screening (Bdks)
        Freight security (Hsf)
             Use For: Cargo security
        Passenger security (Hsp)
        False alarms (Security) (Hsu)
        National security (Hsw)
             Use For: Homeland security
            National defense (Hswd)
            Defense (Hswe)
                 Use For: Defence
                Civil defense (Hswec)
    Crimes (Hu)
         Related Term (Associative): Criminal justice (Csijb); Crime victims (Mswvc); Organized crime (Ny)
        Violent crimes (Hub)
             Use For: Violence
            Homicide (Hubh)
                Vehicular homicide (Hubha)
            Suicide (Hubs)
                Vehicular suicide (Hubsa)
        Property crimes (Hud)
            Theft (Hudb)
                 Related Term (Associative): Loss and damage (Hw)
            Sabotage (Huds)
            Vandalism (Hudv)
                Graffiti (Hudvg)
        Fraud (Huf)
        Terrorism (Huh)
             Related Term (Associative): Weapons of mass destruction (Qtpym)
            Bombings (Huhc)
        Smuggling (Hus)
            Drug smuggling (Husd)
        Crimes involving transportation (Hut)
            Vehicle theft (Huta)
                 Use For: Stolen vehicles
            Crimes aboard public vehicles (Hute)
                Crimes aboard aircraft (Huted)
                Crimes aboard buses (Hutef)
            Hijacking (Huth)
                Carjacking (Huthc)
                Skyjacking (Huthf)
                     Use For: Air piracy
                     Related Term (Associative): Sky marshals (Msxus)
            Piracy (Hutp)
                 Use For: Pirates
            Smuggling (Huts)
        Traffic violations (Huv)
            Moving violations (Huvm)
                 Related Term (Associative): Drunk driving (Hmdsedd)
                Driving without a license (Huvmd)
                     Use For: Unlicensed driving
                     Related Term (Associative): ; ; Driver licenses (Crhym)
                Red light running (Huvmr)
                     Related Term (Associative): Red interval (Traffic signal cycle) (Dcmthcskjr)
            Parking violations (Huvp)
        Threats (Huw)
        Negligence (Hux)
    Criminal histories (Hv)
         Use For: Criminal records; Driver criminal history
        Recidivism (Hvr)
    Loss and damage (Hw)
         Related Term (Associative): Theft (Hudb); Offenders and victims (Msw)
        Losses (Hwb)

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