This is the 4994th most frequent Russian word.
легковых
"легковых" translates to "passenger" (as in passenger cars).
Here, 'легковых' is used as part of the phrase 'легковых автомобилей', which refers to 'passenger cars' and functions as an adjective to describe automobiles.
На стоянке было множество легковых автомобилей.
There were many passenger cars in the parking lot.
In this sentence, 'легковых' modifies 'машин', indicating the type of cars being referred to, specifically 'passenger cars'.
В компании занимаются продажей легковых машин.
The company deals in selling passenger cars.
Here, 'легковых' is used to describe 'транспортных средств', specifying the kind of vehicles being discussed, namely 'passenger vehicles'.