The name of a generated section's line layer: its key under layers.sections.<type>.
layers.sections.<type>
Derived from the section type, so motorway is drawn by routeSectionMotorwayLine. Each module instance prefixes it into the MapLibre layer id, which sourceAndLayerIDs lists.
motorway
routeSectionMotorwayLine
sourceAndLayerIDs
The name of a generated section's line layer: its key under
layers.sections.<type>.