centerline

cen·ter·line  (sntr-ln)

n.

1. A line that bisects something into equal parts.

2. A painted line running along the center of a road or highway that divides it into two sections for traffic moving in opposite directions, or, in the case of a divided highway, for lines of traffic moving in the same direction at different speeds.

Thesaurus

Noun

1.

centerline - a line that bisects a plane figure center line line - a length (straight or curved) without breadth or thickness; the trace of a moving point