Abstract: Previous studies have shown that crashes on curve sections of rural roadways have a higher severity than straight sections. Recent research at Clemson University indicated that crashes are more than 4 times more likely to be fatal on curve sections compared to straight sections. The research also found that one of the primary contributing factors to fatal crashes on curve sections is excessive speed. To enhance safety on highway curves, there is significant need for a mechanism to keep drivers from exceeding safe speeds when negotiating curves. This poster presents a driver warning system application designed to alert drivers if they are driving too fast to safely maneuver a curve. The application combines curve and vehicle characteristics to determine the maximum safe speed of vehicles about to enter a curve. By comparing the actual vehicle speed to the maximum safe speed, an appropriate warning message can be identified to alert the driver. The application uses novel methods to extract curve radius and super elevation from existing data sources. A digital twin is one of the methods used to determine maximum safe speed.