Lyric discussion by makeshift 

"But here as we're coming down And we're sounding out: It's a terrible, terrible tide As it lights upon your eye

But there on the motorway Reeks of marmalade It's a chemical, chemical kind As it lights upon your eye Lights upon your eye"

A terrible tide could be tears, and light hitting those tears. And the motorway could be a metaphor for her face, with the tears as the cars driving down her face. Better yet, the lights upon her eye could be the "headlights" of the tear, or just light being refracted in the teardrops. Although, I could be reading into this too much.

An error occured.