What safety feature prevents riders from falling out of their seats?

The correct answer is that restraint systems are the primary safety feature that prevents riders from falling out of their seats on roller coasters. These systems are designed to securely hold a rider in place throughout the ride experience, ensuring safety during various movements, including twists, turns, and inversions. Restraint systems can come in many forms, such as over-the-shoulder harnesses, lap bars, or even more advanced configurations that adapt to the ride's design and intensity.

While padding systems, seat belts, and lap bars all contribute to rider comfort and additional safety, restraint systems encompass a broader range of mechanisms specifically focused on the secure containment of riders. This is crucial for both the prevention of accidents and for enhancing the thrill of the ride without compromising safety. Each type of restraint system has its own unique application depending on the roller coaster's design and intended ride experience.