What is the meaning of the following road marking (where there is a lay-by and curbstones)?

1. A parking space for two-wheelers.
2. Correct answer: Stopping is permitted for certain types of vehicles, as indicated in the signpost in place.
3. Stopping in the marked area is permitted for all types of vehicles.
4. A place where stopping is permitted for non-motor vehicles only.

WhyA stop marking with a lay-by is a place for the vehicles named on the sign. Others may not stop there.