I still do n't know what was causing the massive failure because I saw no wrecked cars . I can only assume the cluster arose from several semi trucks all huddled together . Once we made it past that , we still had to drive to the exit and park .
According to the above context, choose the best option to answer the following question.
Question: What kind of failure happened ?
Options:
- The " truck sale " on the semi 's ahead was very popular and we missed getting in line .
 - The drive in movie was late
 - Traffic was blocked .
 - The free turkey giveaway was postponed .


Traffic was blocked .