units of transportation measurement describes the units of measure to measure the quantity and traffic of transportation used in transportation statistics, planning, and their related fields.
Currently popular units are:
1 pkm = (1/1.609344) pmi = 0.62137119223733396961743418436332 pmi
Outside the USA and internationally the Metric units (pkm and tkm) are used. (Inaviation where United States customary units still widely used, the International Civil Aviation Organization (ICAO) releases its statistics in the Metric units.)
In the USA, United States customary units are used.
(Please comment on the usage in the United Kingdom.)
The dimension of the measure is the product of payload quantity and the length.
1 t = (1/0.90718474) short tons = 1.1023113109243879036148690067251 short tons.
The transportation traffic can be defined as the quantity defined from the transportation quantity, with the dimension of the transportation quantity divided by unit time. Often hidden as the period of totalization, the figures appear in statistics are often quantity per unit time, say pkm / year or tmi / month . Due to the differences and variation in the length of months, quarters, and years, there is some ambiguity.
Here is an example of transportation statistcs.
World Air Transport Statistics 51st Edition, ICAO
