Etymology
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passenger (n.)

mid-14c., passager "a passer-by; a traveler," from Old French passagier, passageor "traveler, passer-by" (Modern French passager), noun use of passagier (adj.) "passing, fleeting, traveling," from passage "mountain pass, passage" (11c.), from passer "to go by," from Vulgar Latin *passare "to step, walk, pass," from Latin passus "step, pace" (from PIE root *pete- "to spread").

And in this I resemble the Lappwing, who fearing hir young ones to be destroyed by passengers, flyeth with a false cry farre from their nestes, making those that looke for them seeke where they are not .... [John Lyly, "Euphues and His England," 1580]

The -n- was added early 15c. (compare messenger, harbinger, scavenger, porringer). The oldest sense now is obsolete; meaning "one traveling in a public vehicle or vessel," especially in exchange for a fare, is attested from 1510s; hence, in modern use, "one riding in a private vehicle driven by another." The railroad passenger-car is attested from 1832. The North American passenger-pigeon was so called from 1802 for its extensive wanderings in search of food; they have been extinct since 1914.

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car (n.)
Origin and meaning of car
c. 1300, "wheeled vehicle," from Anglo-French carre, Old North French carre, from Vulgar Latin *carra, related to Latin carrum, carrus (plural carra), originally "two-wheeled Celtic war chariot," from Gaulish karros, a Celtic word (compare Old Irish and Welsh carr "cart, wagon," Breton karr "chariot"), from PIE *krsos, from root *kers- "to run."

"From 16th to 19th c. chiefly poetic, with associations of dignity, solemnity, or splendour ..." [OED]. Used in U.S. by 1826 of railway freight carriages and of passenger coaches on a railway by 1830; by 1862 of streetcars or tramway cars. Extension to "automobile" is by 1896, but from 1831 to the first decade of 20c. the cars meant "railroad train." Car bomb first attested 1972, in reference to Northern Ireland. The Latin word also is the source of Italian and Spanish carro, French char.
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car-wash (n.)
also carwash, by 1924, "act of washing an automobile," also "commercial establishment where an automobile can be washed," from car (n.) + wash (n.).
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flat-car (n.)
1839 in railroading, from flat (adj.) + car (n.).
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cable-car (n.)
"car on a cable railroad," 1879, from cable (n.) + car. A streetcar moved by an endless cable which is cased in a small tunnel under the railway and kept in motion by a remote stationary engine.
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hand-car (n.)
1846 in railroading sense, from hand (n.) + car.
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stock-car (n.)
racing car with a basic chassis of an ordinary commercially produced vehicle, 1914, American English, from stock (n.2) + car. Earlier "a railroad car used to transport livestock" (1858).
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car-park (n.)

"place for parking automobiles," 1926, British English, from car (n.) + park (n.).

Oh the torn up ticket stubs
From a hundred thousand mugs
Now washed away with dead dreams in the rain;
And the car-park's going up
And they're pulling down the pubs
And it's just another bloody rainy day
[The Pogues, "White City," 1989]
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car-pool (n.)
also carpool, "the sharing of a car ride by more than one person going to the same destination," 1942, American English, from car + pool (n.2). As a verb from 1962. Related: Carpooled; carpooling.
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