What is the problem in detecting an obstacle before a motorcycle at a very late stage?

1. Correct answer: The time left for responding and braking is too short.
2. The obstacle’s weight can not be precisely evaluated.
3. There is no problem in late detection of an obstacle.
4. There is not enough time to change gears.

WhyIf you notice an obstacle at the last moment, there is too little time left to react and brake.