The parts, and where each sits by default:
mainLines — the route lines, with every section line (the bands drawn under the route line
and the stretches drawn over it). Below the map's labels.instructionLines — the guidance lines and their arrows. Below the map's labels, above the
route lines.icons — every icon the route draws: waypoints, summary bubbles, charging stops, border
crossings and section icons. Most sit above the map's labels; section icons drawn on generated
section types and the tunnel sign sit below them. A target puts them all beneath it, those two lowest.Each part keeps its own layers' order wherever it goes. Section signs are not a part: their SectionSignConfig.priority settles which symbols they give way to, among the route icons and the map labels wherever this put them.
Where the route's layers sit in the map's layer stack: one target for the whole route, or one per part of it.