What would be the most effective ways to design a stress-free commuting experience for urban dwellers, considering the psychological factors that contribute to driving-induced anxiety, and how could these solutions be integrated into existing public transportation systems to create a seamless, anxiety-reducing travel experience for millions of commuters, while also taking into account the constraints of limited resources, infrastructure, and competing priorities in urban planning, and what role could innovative technologies, such as AI-powered traffic management, play in reducing stress and anxiety associated with driving and commuting, and how could these solutions be scaled up to have a significant impact on the mental health and well-being of urban populations, while also addressing the needs of diverse user groups, including cyclists, pedestrians, and drivers, and what would be the key performance indicators to measure the success of such interventions, and how could they be evaluated and refined over time to ensure they remain effective in reducing stress and anxiety associated with driving and commuting.