According to the picture, what limitation is faced by the green (commercial) pick-up truck that wishes to turn right?

1. The motor scooter intends to drive straight; hence there is no danger in turning right.
2. The pick-up truck is permitted to turn right even though the motorcycle is on his right because the law does not forbid it
3. Correct answer: The driver of the pick-up truck should be careful, because there is another vehicle driving in a “blind spot” to his right.
4. The pick-up truck is statutory prohibited to turn right.

WhyThere is a scooter on the pick-up's right, in its blind spot. The pick-up driver must be especially careful, for example when turning right.