A crossover vehicle is a type of automobile that blends characteristics between two different kinds of vehicles, typically combining the features of a car and an SUV). Crossovers are built on a unibody chassis construction shared with passenger cars, as opposed to traditional SUVs, which are built on a truck chassis). They have an increased ride height and higher ground clearance like an SUV, but are lighter and more car-like in their design. Crossovers are often described as "car-like SUVs" or "car-based SUVs"). They typically have greater interior comfort, a more comfortable ride, better fuel economy, and lower manufacturing costs than truck-based SUVs, but inferior off-road and towing capabilities). Many crossovers lack an all-wheel drive or four-wheel-drive train, which causes some to question their definition as "sports utility vehicles"). However, crossovers are becoming increasingly popular due to their relatively good fuel efficiency levels and higher seating positions.