I think all the car references like "tunnel route", and "headlights on the hillside" are about being in a relationship that you know is doomed to fail. Like you can see the relationship moving toward a tragic end, or in the song's case a car crash.
The singer can tell "she's" driving them in the wrong direction, so he obviously feels she's at fault. But what has she done? What's bigger than the both of them?
Maybe it's something so big that he already knows it can't be fixed between them.
I think all the car references like "tunnel route", and "headlights on the hillside" are about being in a relationship that you know is doomed to fail. Like you can see the relationship moving toward a tragic end, or in the song's case a car crash.
The singer can tell "she's" driving them in the wrong direction, so he obviously feels she's at fault. But what has she done? What's bigger than the both of them? Maybe it's something so big that he already knows it can't be fixed between them.