The evidence should be able to speak for you, especially if you can’t remember exactly what happened (accidents often happen in the blink of an eye).
If you are asked to give a testimony, make sure to limit your answers to things you know. Avoid phrases like “I think,” “I’m not hurt,” “It was my fault,” or “I’m sorry”. These may seem like innocuous phrasing, but as this is a legal situation, you want to avoid incriminating words.