real time collision on animation path

[whj]

Sorry I didn't make it clear. I need to know the position in advance, like where the car could be in the next 2 seconds. So I can predict if they would crash. (I know your sample code is a way to predict crash based on distance. But my research need a way to predict crash based on time.) Since all cars have their defined paths and speed using animation path, I'm wondering if I can get the expected position beforehand? I really appreciate your help.