Traffic light pair

Traffic light pairs are collectible positions of panes of British stamps. They are named for their array of colored dots corresponding to the the ink colors used in printing. These are actually features used by printers to check for proper print registration and that all colors are printed properly.

Sometime in the 1970s, panes had internal gutters, so that traffic light pairs only exist as gutter pairs. Otherwise, traffic lights are found on issues from the 1960s in the outer margin, as they are following the sheet/pane format change after the 1970s. [[Category:T]]