Which of the following statements regarding worn tyres with poor tread depth is true?
It is the grooves/treads in the tyre that drain off water. Without these, the tyre becomes like a boat (the hull of a boat is smooth so that it can flow well; not a desirable characteristic in a car tyre).
Useful links:
Körkortonline.se offers driving licence theory tests in English (free demo test), Swedish (free demo test) and Arabic (free demo test). This is an example of an explanation of a test question.
More examples of explanations: