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Concept
Units of measurement in transportation
Summary
The units of measurement in transportation describes the unit of measurement used to express various transportation quantities, as used in statistics, planning, and their related applications.
The currently popular units are:
kilometre (km) or kilometer is a metric unit used, outside the US, to measure the length of a journey;
the international statute mile (mi) is used in the US; 1 mi = 1.609344 km
nautical mile is rarely used to derive units of transportation quantity.
vehicle-kilometre (vkm) as a measure of traffic flow, determined by multiplying the number of vehicles on a given road or traffic network by the average length of their trips measured in kilometres.
vehicle-mile (, or VMT) same as before but measures the trip expressed in miles.
Passenger; Person (often abbreviated as either "pax" or "p.")
Passenger-distance is the distance (km or miles) travelled by passengers on transit vehicles; determined by multiplying the number of unlinked passenger trips by the average length of their trips.
passenger-kilometre or pkm internationally;
passenger-mile (or pmi ?) sometimes in the US; 1 pmi = 1.609344 pkm
Passengers per hour per direction
Passengers per hour per direction (pphpd) measures the maximum route capacity of a transport system.
A system may carry a high number of passengers per distance (km or mile) but a relatively low number of passengers per bus hour if vehicles operate in congested areas and thus travel at slower speed.
A transit system serving a community with a widely dispersed population must operate circuitous routes that tend to carry fewer passengers per distance (km or mile). A higher number is more favorable.
Freight is measured in mass-distance. A simple unit of freight is the kilogram-kilometre (kgkm), the service of moving one kilogram of payload a distance of one kilometre.
kilogram (kg), the standard SI unit of mass.
tonne (t), a non-SI but an accepted metric unit, defined as 1,000 kilograms.
"short ton" is used in the US; 1 short ton = 2,000 pounds = 0.907 tonnes.
1 t = (1/0.
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