* Off-road driving: This is the most common reason. 4x4s excel on unpaved roads, trails, mud, snow, sand, and other challenging terrains. They provide better grip and climbing ability than 2WD vehicles.
* Towing heavy loads: 4x4s are better equipped to handle the extra weight and stress of towing trailers, boats, or other heavy equipment, especially on inclines or uneven surfaces.
* Driving in adverse weather conditions: Snow, ice, and heavy rain significantly reduce traction. 4x4 systems provide increased control and stability in such conditions, making driving safer.
* Improved stability and handling: Even on paved roads, 4x4 can provide increased stability, especially in corners or when driving on loose surfaces like gravel.
* Increased ground clearance: Many 4x4 vehicles have higher ground clearance than 2WD vehicles, allowing them to traverse obstacles and uneven terrain more easily.
However, it's important to note that 4x4 vehicles often come with drawbacks:
* Higher purchase price: 4x4 vehicles are generally more expensive than comparable 2WD vehicles.
* Lower fuel economy: The added weight and mechanical complexity of the 4x4 system typically result in lower fuel efficiency.
* Increased maintenance costs: The more complex drivetrain can lead to higher maintenance and repair costs.
So, the "what for" depends entirely on the driver's needs and lifestyle. If you frequently drive off-road, tow heavy loads, or live in an area with harsh weather conditions, a 4x4 vehicle may be a worthwhile investment. If not, a 2WD vehicle will likely suffice and save you money.
