Our goal is to improve roadway safety for the public and to save lives by developing innovative and cost-effective technologies that leverage the power of smartphones and AI. Our focus is to efficiently identify high crash-risk locations, primarily dangerous roadway curves (turns), evaluate their safety condition, and recommend safety improvement countermeasures. This would benefit 1) transportation agencies for enhanced roadway safety management and improvement, and 2) logistics companies and connected and autonomous vehicles (CAV) for safer navigation.