MapLibre resolves symbol collisions from the topmost layer down, so the layer underneath is the one that gives way.
belowMapLabels — the signs give way to everything, the base map's own labels included, so a
sign never lands on a street or place name, at the cost of showing fewer in a city. Cheap under
along placement, where the dropped sign is posted again further down the stretch.belowRouteIcons — the signs give way to every icon the route draws, section icons included,
each of which says something the road cannot, but take precedence over the base map's labels.aboveRouteIcons — the signs give way to nothing, for a map whose subject is the limits.
What a section's signs give way to when two symbols want the same spot.