| Terms | Definitions |
|---|
| Harmful Event | Event causing injury or damage. ( Trucks Involved Fatal Accidents ) |
| Hazardous Cargo | A substance or material which has been determined by the Secretary of Transportation to be capable of posing an unreasonable risk to health, safety, and property when transported in commerce, and which has been so designated. The term includes hazardous substances, hazardous wastes, marine pollutants, and elevated temperature materials as defined in this section, materials designated as hazardous under the provisions of 49 CFR 172.101 and 172.102, and materials that meet the defining criteria for hazard classes and divisions in 49 CFR 173. ( Trucks Involved Fatal Accidents ) |
| Hazardous Material | A substance or material which has been determined by the Secretary of Transportation to be capable of posing an unreasonable risk to health, safety, and property when transported in commerce, and which has been so designated. The term includes hazardous substances, hazardous wastes, marine pollutants, and elevated temperature materials as defined in this section, materials designated as hazardous under the provisions of 49 CFR 172.101 and 172.102, and materials that meet the defining criteria for hazard classes and divisions in 49 CFR 173. ( Marine Casualty and Pollution Database ) |
| Hazmat | Hazardous Material; A substance or material which has been determined by the Secretary of Transportation to be capable of posing an unreasonable risk to health, safety, and property when transported in commerce, and which has been so designated. The term includes hazardous substances, hazardous wastes, marine pollutants, and elevated temperature materials as defined in this section, materials designated as hazardous under the provisions of 49 CFR 172.101 and 172.102, and materials that meet the defining criteria for hazard classes and divisions in 49 CFR 173. ( Railroad Accident/Incident Reporting System ) |
| Hazardous material (Hazmat) is a substance or material, including a hazardous substance, which has been determined by the Secretary of Transportation to be capable of posing an unreasonable risk to health, safety, and property when transported in commerce, and which has been so designated. ( Railroad Accident/Incident Reporting System ) |
| Head-on Collision | Refers to a collision where the front end of one vehicle collides with the front end of another vehicle while the two vehicles are traveling in opposite directions. ( Fatality Analysis Reporting System ) |
| Heavy Rail | A transit mode that is an electric railway with the capability for a heavy volume of traffic. It is characterized by high speed and rapid acceleration passenger cars operating singly or in multi-car trains on fixed rails; separate rights-of-way from which all other vehicular and foot traffic are excluded; sophisticated signaling, and high platform loading. ( National Transit Database ) |
| An electric railway with the capacity for a heavy volume of traffic and characterized by exclusive rights-of-way, multi-car trains, high speed and rapid acceleration, sophisticated signaling, and high platform loading. ( National Ferry Database ) |
| High Occupancy Vehicle | Vehicles that can carry two or more persons. Examples of high occupancy vehicles are a bus, vanpool, and carpool. ( Highway Perfomance Monitoring System ) |
| Highway Advisory Radio | A radio broadcast system used to communicate traffic information to traveling public through the vehicle radio. The highway advisory radio frequency is generally provided to motorists on a roadside sign. The broadcast message may include information about driving hazards, detours, hazardous driving conditions, delays, and motor vehicle laws. ( Highway Perfomance Monitoring System ) |
| Highway-Rail Crossing Accident/Incident | An impact between on-track railroad equipment and a highway user (e.g., an automobile, bus, truck, motorcycle, bicycle, farm vehicle, pedestrian or other highway user) at a designated crossing site. Sidewalks, pathways, shoulders and ditches associated with the crossing are considered to be part of the crossing site. The term highway user includes pedestrians, cyclists, and all other modes of surface transportation. ( Railroad Accident/Incident Reporting System ) |
| Highway-Rail Grade Crossing | A location where a public highway, road, street, or private roadway, including associated sidewalks and pathways, crosses one or more railroad tracks at grade. ( Railroad Accident/Incident Reporting System ) |
| Hispanic Origin | Referring to any person whose primary ethnic ancestry is of primarily Spanish-speaking countries. Hispanic origin includes Mexican, Puerto Rican, Cuban, Central or South American, or other Hispanic origin. ( American Travel Survey ) |
| Hit and Run | A hit-and-run occurs when a motor vehicle in transport, or its driver, departs from the scene after being involved in a crash prior to police arrival on the scene. Fleeing pedestrians and motor vehicles not in transport are excluded from the definition. It does not matter whether the hit-and-run vehicle was striking or struck. ( Trucks Involved Fatal Accidents ) |
| Hit-and-Run | A hit-and-run occurs when a motor vehicle in transport, or its driver, departs from the scene after being involved in a crash prior to police arrival on the scene. Fleeing pedestrians and motor vehicles not in transport are excluded from the definition. It does not matter whether the hit-and-run vehicle was striking or struck. ( Fatality Analysis Reporting System, General Estimates System (NASS/GES) ) |
| Hot-Deck | A method of imputation whereby values of variables for good records in the current (hot) survey file are used to impute for blank values of incomplete records. ( General Estimates System (NASS/GES) ) |
| Hours Driving | Refers to the number of hours elapsed from the time the truck driver began driving until the time of the incident. ( Trucks Involved Fatal Accidents ) |
| Household | A group of persons whose usual place of residence is a specific housing unit; these persons may or may not be related to each other. The total of all U.S. households represents the total civilian non-institutionalized population. Does not include group quarters (i.e., 10 or more persons living together, none of whom are related). ( Nationwide Personal Transportation Survey ) |
| The basic sampling and reporting unit for collecting travel and other information in the American Travel Survey. A household consists of all persons who occupy a housing unit such as a house, apartment, or rooms that form separate living quarters. ( American Travel Survey ) |
| Household Composition | One of any classifications regarding the relationship of household members to each other and the presence or absence of children. ( American Travel Survey ) |
| Household Income | The money income of all family members in a household, including those temporarily absent. Annual income is asked for the 12 months preceding the interview. Includes income from all sources, such as wages and salary, commissions, tips, cash bonuses, income from a business or farm, pensions, dividends, interest, unemployment or work men's compensation, social security, veterans' payments, rent received from owned property (minus the operating costs), public assistance payments, regular gifts of money from friends or relatives not living in the household, alimony, child support, and other kinds of periodic money income other than earnings. Excludes in-kind income such as room and board, insurance payments, lump-sum inheritances, occasional gifts of money from persons not living in the same household, withdrawal of savings from banks, tax refunds, and the proceeds of the sale of one's house, car or other personal property. ( Nationwide Personal Transportation Survey ) |
| Household Members | All people, whether present or temporarily absent, whose usual place of residence is in the sample unit. Includes people staying in the sample unit who have no other usual place of residence elsewhere. ( Nationwide Personal Transportation Survey ) |
| Household Trip | One or more household members traveling together. ( Nationwide Personal Transportation Survey ) |
| Household Type | A classification taking into account the number of household members and their relationship to each other. Household types include family households and non-family households. Family households include married-couple households, female householders, and male householders with and without children in selected age groups. Non-family households include male and female householders living alone or not living alone. ( American Travel Survey ) |
| Household Vehicle | A motorized vehicle that is owned, leased, rented or company owned and available to be used regularly by household members during the travel period. Includes vehicles used solely for business purposes or business-owned vehicles if kept at home and used for the home to work trip, (e.g., taxicabs, police cars, etc.) which may be owned by, or assigned to, household members for their regular use. Includes all vehicles that were owned or available for use by members of the household during the travel period even though a vehicle may have been sold before the interview. Excludes vehicles that were not working and not expected to be working within 60 days, and vehicles that were purchased or received after the designated travel day. ( Nationwide Personal Transportation Survey ) |
| Hull Identification Number | A unique twelve-digit identification number assigned to a vessel under subpart C of 33 CFR part 181. ( Recreational Boating Accident Reporting Database ) |
| Hydrofoil | A motorboat that has metal plates or fins attached by struts fore and aft for lifting the hull clear of the water as speed is attained. ( National Ferry Database ) |
Printable Version