Documentation says that waypoints limit is 8 points. But I have to draw a line with more than 8 waypoints. How to do that?
Try sending multiple requests.
MAX_WAYPOINTS_EXCEEDED indicates that too many DirectionsWaypoints were provided in the DirectionsRequest. The maximum allowed waypoints is 8, plus the origin, and destination. Maps API Premier customers are allowed 23 waypoints, plus the origin, and destination.
You can go for API Premier but i guess it will cost you about 10.000$ a year
来源：https://stackoverflow.com/questions/4418875/google-maps-api-directions-api-waypoints-limitation