Passenger buses occupy a critical space in public transportation systems worldwide, tasked with moving large numbers of people safely, efficiently, and comfortably. The suspension system—responsible for absorbing road irregularities, maintaining stability, and ensuring passenger comfort—plays a decisive role in the overall driving and riding experience. Among various suspension components, leaf springs remain the preferred choice for buses due to their simplicity, load-bearing capacity, and proven reliability. However, not all leaf springs are equal. Subtle variations in design geometry, material composition, and assembly configuration can significantly influence both ride comfort and safety. This article explores, in technical detail, how the design parameters of leaf springs affect the dynamic behavior of passenger buses, with a focus on comfort and safety performance.