halo - Beneath the route's own lines and wider than its outline, so the section shows as a
band hugging the route on both sides. The route keeps its own colour.inline - Above the route line at the route's own width, so the route itself appears in the
section's colour along that stretch. tunnel and ferry draw this way.ferry, traffic, tunnel and vehicleRestricted default to inline, and every other type
that draws a line to halo.
How a section's line relates to the route line it marks, in both layer order and width, since neither reads as intended without the other.