When approaching a right or left turn, the application many times doesn't give enough time to respond.
I assume this might be partly because of inaccuracies in the car location, but I think the basic problem is not recognizing it takes time to move from lane to lane, especially in crowded roads.
In my opinion you should lengthen the time for the final alert to at least 6-8 seconds before the turn.
I must emphasize that this time should be the time of the end of the alert, and not the beginning of it!