A couple sits on a bench near a racetrack while the speaker tries to hold the relationship together by refusing to think about where it's heading. "Don't think about the finish line" is advice for staying the course, but it also sounds like avoidance: keep your eyes on the road and never ask what the road is for. The setting is loud and fuel-heavy, with engine roar arriving "in waves, like the ocean," which makes even the background feel relentless and hard to hold still against.
The second stanza turns. The woman wants more, and the speaker's response is to say "You go on, then," while he carves their love into the bench. He stops before the plus sign and her name, as if he can't finish what he's started. That unfinished carving suggests he is half-committed and half-letting-go. The mood is wistful and quietly resigned, with a tired tenderness. The last line, with its wave that won't stop, suggests the ending is already in motion.