SUV

A sport utility vehicle, or SUV, is a specific classification of automobile. These vehicles combine elements of passenger cars with features found in off-road vehicles. Common traits include raised ground clearance and four-wheel drive systems.

Because there is no single, universally agreed-upon definition, the term can be quite loose. Some experts argue an SUV must be built on a light truck chassis. Others believe any vehicle with off-road design features qualifies. This lack of a strict definition causes the term to vary by country. In the United Kingdom, people often use terms like "4x4" or "jeep" instead.

The way an SUV is built determines how it performs. Historically, most SUVs used body-on-frame construction. This method involves placing the vehicle body on top of a separate, sturdy frame. This design is common in light trucks and many traditional off-road vehicles. However, many modern SUVs now use unibody construction. In a unibody design, the frame and the body are manufactured as a single, integrated piece. This is similar to how most modern passenger cars are built.

Vehicles that use unibody construction are often called crossover SUVs. The lines between these types are becoming blurred due to new technology and marketing.

There are several distinct stages in the development of the SUV. The earliest predecessors date back to military and low-volume models from the late 1930s. In 1949, manufacturers began introducing four-wheel-drive station wagons and carryalls. The 1955 GAZ-M20 Pobeda M-72 was a Russian model that acted as an early crossover. Later, the 1977 Lada Niva became the first off-road vehicle to use unibody construction and coil-sprung independent front suspension. The 1984 Jeep Cherokee (XJ) was a major turning point for unibody sales. By the late 1990s and early 2000s, SUVs became much more popular than large sedans.

Today, SUVs represent a massive portion of the global automotive industry. In 2021, SUVs accounted for 45.9% of the world's passenger car market. Despite this success, they face significant environmental criticism. SUVs generally have poorer fuel efficiency than smaller passenger cars. They also require more resources to manufacture. These factors contribute to environmental degradation and climate change.

Between 2010 and 2018, SUVs were the second-largest contributor to the global increase in carbon emissions. They emit approximately 700 megatonnes of carbon dioxide every year. This gas is a primary driver of global warming.

Safety is another complex issue regarding these vehicles. Because SUVs are tall, they have a high center of gravity. This makes them more prone to rollover accidents. In 2003, SUVs were 2.5 times more likely to roll over than regular cars. In the early 2000s, SUV occupants were nearly three times as likely to be killed in a rollover compared to other passengers.

However, modern technology like electronic stability control (ESC) has helped. By 2015, the rollover death rate for 2011 models was less than a quarter of what it was for 2004 models. This shows how engineering can mitigate inherent design risks.

SUVs also present unique risks to other road users, such as pedestrians and cyclists. Their high front-end profiles can cause more damage during a collision. In the United States, SUVs are often exempt from certain bumper regulations. This can result in the impact hitting a smaller car at a higher, more dangerous location. A 2021 study found that SUVs are eight times more likely to kill children in a collision than passenger cars. This has led to public protests against SUVs in many urban areas. Some cities, like Paris, have even implemented higher parking charges for SUVs to manage street capacity.

Finally, the classification of an SUV affects how they are regulated and taxed. In the United States, many SUVs are classified as light trucks. This classification previously allowed them to be regulated less strictly regarding fuel economy and emissions. In India, all SUVs fall into the "Utility Vehicle" category and face specific excise taxes. In Australia, lower import duties once helped boost SUV sales compared to passenger cars. These various rules show how the SUV is not just a vehicle, but a major factor in global economics and law.