OptionalminThe lowest zoom the signs are drawn at.
OptionalplacementWhere the signs are posted along the stretch.
OptionalpriorityWhat a sign gives way to when another symbol wants the same spot.
Where the route icons sit is RoutingModuleConfig.beforeLayerConfig's to say; this places the signs relative to them and to the map's labels.
follows placement: 'belowRouteIcons' under atChange, where the sign
is the only one posting that change; 'belowMapLabels' under along, where the next repeat
posts it again.
OptionalunitThe unit every sign reads in, whatever the road posts.
The sign a section type posts its own value on.
Remarks
speedLimitis the one type that takes this, and a sign is the whole of what it draws — there is no line along the stretch, because a line would mark every stretch that carries a limit without ever saying what the limit is. SectionDisplayConfig.visible switches the signs themselves.The sign follows the road rather than the reader. Where the route also carries
countrysections, each sign takes the face, the unit and the numeral colour of the country its stretch runs through: the white disc most of Europe posts on, the yellow one Sweden, Finland and Iceland use, theSPEED LIMITplaque of the United States, and Japan's blue numerals. A country with no entry posts the white disc in km/h.Where mph is posted the number is converted and rounded to the step signs come in. Without
countrysections the display units decide the face and the unit, and an explicit unit overrides both.A sign stands where the limit changes; placement repeats it down the stretch instead. Signs scale with the zoom, as the ferry and toll-road icons do; minZoom decides how early they appear at all.