Context: Then I had met another guy who was going to the same university in the flight . So we went around the houston airport for a while , as our ground shuttle was supposed to pick us up at 9:30 pm . The shuttle arrived at the airport around half an hour late .
Question: Why may the shuttle have been late ?
Option 0: There was very heavy traffic around the airport at the time .
Option 1: The driver was going to drive them to the university instead .
Option 2: The driver wanted them to miss their flight .
Option 3: None of the above choices .
Answer: 0