This study explores the impact of speed, road adhesion, and dynamic maneuvers on the lateral stability of vehicles equipped with four-wheel steering (4WS) systems. The research uses CarSim simulation software to evaluate vehicle performance under various speeds and adhesion coefficients during lane changes and turning maneuvers. Results reveal that 4WS significantly enhances stability and handling at moderate speeds and favorable adhesion conditions. However, high-speed operations, particularly on low-adhesion surfaces, increase instability and safety risks. Practical implications emphasize the importance of maintaining safe speeds, particularly under adverse road conditions and reducing speed during sharp turns to counteract centrifugal forces. These findings highlight the critical role of cautious driving and adherence to speed limits in improving overall safety for 4WS vehicles.