encyclopedia

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Sa Sb Sc Sd Se Sf Sg Sh Si Sk Sl Sm So Sp Sr Ss St Su Sw Sy
Sp Spa Spe Spi Spl Spo Spr Spu

SPACE

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In the context of transportation vehicle capacity, a space is a seat or the standing area for one passenger. (TRB)

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SPACING

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The distance between consecutive vehicles, measured front-to-front. (TRB)

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