What is the primary reason for using tempered glass in side windows?

The primary reason for using tempered glass in side windows is safety under impact. Tempered glass is specially treated through a process of extreme heating and rapid cooling, which increases its strength compared to regular glass. When tempered glass is broken, it shatters into small, blunt pieces that are less likely to cause injury, making it a safer option for vehicle occupants in the event of an accident or impact.

The design of side windows using tempered glass ensures that they can withstand the stresses of everyday use, as well as potential impacts such as an accident. This safety feature is critical, given that side windows are often more exposed to road debris or collision impacts than other windows in a vehicle.

Other options such as cost-effectiveness, enhanced visibility, and ease of replacement, while beneficial attributes, are not as significant as the safety aspect when it comes to the use of tempered glass. Ensuring the well-being of passengers and minimizing the risk of injury in case of glass breakage is the driving force behind the choice of tempered glass for side windows in vehicles.