The phrase "smaller vehicles" refers to automobiles or motorbikes that are smaller in size compared to standard passenger cars. These types of vehicles can include compact cars, subcompacts, SUV's and trucks, as well as motorcycles, scooters, and other small-engine powered vehicles. The term is often used to describe a specific category or type of vehicle that is generally more fuel efficient, easier to maneuver in traffic, and requires less space for parking than larger vehicles.