Buying a car is everyone’s dream as one succeeds in life and achieves new milestones. The many benefits of owning a car include on-demand transportation, mobility, independence and convenience. Cars also extend certain societal and economic benefits such as the ability for humans to move freely from place to place, job and wealth creation, as a result of automobile production and maintenance, transportation provision, society wellbeing resulting from leisure and travel opportunities, and revenue generation from the tax opportunities.
However, cars also have their own environmental disadvantages as transportation is a major contributor to air pollution especially in industrialized countries resulting into people breathing unhealthy air full of hazardous gases like carbon dioxide, carbon monoxide, hydrocarbons, and nitrogen. This environmental degradation can be reduced via higher fuel taxes that may provide a strong incentive for the production of more efficient, hence less polluting, car designs and the development of alternative fuels. It also gives consumers to purchase lighter, smaller, more fuel-efficient cars, or to not drive. Alternative fuel cars are another option that is less polluting as compared to usual petroleum powered vehicles.
There are different types of cars with that run on different engines depending on the type of fuel that is used. Most automobiles that are used today are driven on petrol or diesel internal combustion engines, which are responsible for air pollution and global warming. Diesel-engined cars create lesser pollution as they have a 50% fuel burn efficiency compared with 27% in the best gasoline/petrol engined cars. Other alternative fuel cars which cause comparatively less pollution are cars with biofuel, ethanol fuel, biogasoline and other alcohol fuels like biobutanol as most alcohols have less energy per liter than gasoline and also increase octane, to improve emissions.
Battery electric cars have silent electric motors due to modern semiconductor controls and improved batteries. These cars also have the ability to deliver a high torque at low revolutions. Steam powered cars have the advantage of producing very low emissions. Compressed air cars use motors powered by compressed air or by air combined with gasoline/diesel/ethanol or electric plant and regenerative braking. These cars use the expansion of compressed air to drive their pistons.
There also different classification of cars, including microcar, a two-seater care with engine of less than 1.0 litre. Some of them are three-wheelers, while the majority have four wheels. A city car is mainly used in urban areas and has greater speed, capacity and (in perception at least) occupant protection are safer in mixed traffic environments and have engines with a maximum displacement of 660 cm³ and the car’s length must be under 3400 mm. Then there are Superminis that have three, four or five doors and are approximately 3900 mm long. Small family car/compact car have can accommodate five adults and usually have engines between 1.4 and 2.2 liters. Large family cars have a large trunk and are usually around 4700 mm long. Other categories of cars include sports cars, grand tourers, executive car/mid-luxury car, convertibles and SUVs.