See https://a-b-street.github.io/docs/tech/map/importing/index.html for an overview. This module covers the RawMap->Map stage.
The various traffic signal generators live in the traffic signal module. Eventually, we might want to move to a trait. For now, there’s a single make_traffic_signal static method in each generator file, which is called to generate a traffic signal of a particular flavor.
Options for converting RawMaps to Maps.