centerline

[ sen-ter-lahyn ]

/ ˈsɛn tərˌlaɪn /

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noun

any line that bisects a plane figure: the centerline of a building plan.

a line along the center of a road or highway dividing it into separate sections for traffic moving in opposite directions.

Radio. the perpendicular bisector of the line connecting two radio transmitters.

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Origin of centerline

First recorded in 1800–10; center + line¹

Officials said an initial investigation found that the woman was driving a Toyota Rav4 and headed north on Fleetwood Drive when she crossed over the centerline and hit the Mack truck head on, police said.
Woman, 83, dies in head-on collision with Mack truck in Prince William County|Dana Hedgpeth|March 4, 2021|Washington Post
The check valves are placed slightly below the centerline of the boiler (fig. 18).
The 'Pioneer': Light Passenger Locomotive of 1851|John H. White
The opposing surface is not flat, but slopes away from the centerline like a boat's bow.
Following the Equator, Complete|Mark Twain (Samuel Clemens)
The check valves are placed slightly below the centerline of the boiler (fig. 18).
Smithsonian Institution - United States National Museum - Bulletin 240|Anonymous

Daoud climbed a ladder, raised the heavy door, and found himself on a walkway built over the centerline of a roof.
The Saracen: Land of the Infidel|Robert Shea
A single leeboard was fitted and secured to the hull with a short piece of line made fast to the centerline of the boat.
The Migrations of an American Boat Type|Howard I. Chapelle