“Which modifications to the infrastructure are needed to ensure that the growing number of tourists in Amsterdam can move around more efficiently?”
The sub-questions could be:
- What have been the effects of the growth in the number of tourists in Amsterdam on traffic flow in the last five years?
- How large is the expected growth in the number of tourists in Amsterdam for the next five years?
- Which are the main traffic bottlenecks?
- What is the design of the infrastructure at the main bottleneck locations?
- Which are the main criteria for effective traffic flow?
- Which measures relating to infrastructure have been taken in similar cities in order to make it easier for tourists to move around?
Sometimes, you can make your sub-questions even more specific, in the form of search questions. Search questions for the last sub-question could be:
- Which measures relating to infrastructure have been taken in Berlin in order to make it easier for tourists to move around?
- Which measures relating to infrastructure have been taken in Barcelona in order to make it easier for tourists to move around?