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 ?
Options:
0. There was very heavy traffic around the airport at the time .
1. The driver was going to drive them to the university instead .
2. The driver wanted them to miss their flight .
3. None of the above choices .
Answer: 0