This is the 12888th most frequent Russian word.
легковые
"Легковые" means "passenger (cars)."
Here, 'легковые' is used as part of the phrase 'легковые автомобили', meaning 'passenger cars'. It describes a type of car intended for personal use.
На парковке стоят разные модели легковых автомобилей.
Different models of passenger cars are parked in the parking lot.
In this sentence, 'легковые' again modifies 'автомобили', emphasizing the distinction between passenger cars and trucks in terms of fuel efficiency.
Легковые автомобили часто имеют меньший расход топлива, чем грузовые.
Passenger cars often have lower fuel consumption than trucks.
Here, 'легковые' is used with 'машины', which is a synonym for 'автомобили', and it similarly refers to passenger cars.