Fill in the blank (_) in the following sentence from the following choices.
Sentence: they had to stop at the highway and not in the tunnel because the _ was lit.

Choice 1: they had to stop at the highway and not in the tunnel because the tunnel was lit.
Choice 2: they had to stop at the highway and not in the tunnel because the highway was lit.
Which of the choices is correct? Respond with only "1" or "2" and no additional text.
2
1. They had to stop at the highway and not in the tunnel because the tunnel was lit.