| Terms | Definitions |
|---|
| GIS | Geographical Information Systems ( National Ferry Database ) |
| GSA | General Services Administration ( Railroad Accident/Incident Reporting System, Trucks Involved Fatal Accidents ) |
| Galvanic | Something which produces a direct electrical current. ( Pipeline Safety Statistics ) |
| Gateway | In international travel, the port where customs clearance takes place. ( Airline Airline Origin and Destination Survey (DB1B) ) |
| Grade | The classification of gasoline by octane ratings. Each type of gasoline (conventional, oxygenated, and reformulated) is classified by three grades - Regular, Midgrade, and Premium. ( U.S. Retail Gasoline Prices ) |
| Grade Crossings | An intersection of highway roads, railroad tracks, or dedicated transit rail tracks that run either parallel or across mixed traffic situations with motor vehicles, light rail, commuter rail, heavy rail, trolleybus or pedestrian traffic. Collisions at grade crossings involving transit vehicles apply only to light rail, commuter rail, heavy rail or trolleybus. ( National Transit Database ) |
| Great Circle Distance | The shortest distance between two points on the earth's surface. ( Commodity Flow Survey ) |
| Great Lakes | A single mode specially created in ORNL's transportation network for the Commodity Flow Survey for mileage calculations which involve transportation via the Great Lakes between the origin and destination ZIP Codes (see the Mileage Calculations section for more details). ( Commodity Flow Survey ) |
| Gross Domestic Product | Gross Domestic Product (GDP) is the most commonly used comprehensive measure of the nation's economic activity. It is the market value of the goods and services produced by labor and property in the United States. GDP replaced Gross National Product (GNP). ( Gross State Product ) |
| Gross Registered Tonnage | See Gross Tonnage. ( Foreign Traffic Vessel Entrances and Clearances ) |
| Gross Tonnage | The internal cubic capacity of all permanently enclosed spaces in and on a vessel, with the exception of certain permissible exemptions. In mathematical terms, it is equal to (0.2+0.02 log10V) where V is the vessel volume in cubic meters. It is expressed in tons of 100 cubic feet. ( Foreign Traffic Vessel Entrances and Clearances ) |
| The weight of all cars, passengers, and freight on a train, exluding the power units (i.e., locomotives). ( Railroad Accident/Incident Reporting System ) |
| Gross Tons | The gross tonnage of a vessel is the internal cubic capacity of all spaces in and on the vessel which is permanently enclosed, with the exception of certain permissible exemptions. It is expressed in tons of 100 cubic feet. ( National Ferry Database ) |
| Gross Vehicle Weight Rating (GVWR) | The maximum rated capacity of a vehicle, including the weight of the base vehicle, all added equipment, driver and passengers, and all cargo loaded into or on the vehicle. Actual weight may be less than or greater than GVWR. ( Fatality Analysis Reporting System ) |
| Ground Crew | The mechanics and technicians who maintain and service aircraft. ( Aviation Accidents Database and Synopses ) |
| Group Quarters | Communal housing, such as dormitories, military bases, prisons and nursing homes. Group quarters are distinct from households. ( Census Transportation Planning Package ) |
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