Every TrafficFlowModule knob with its kind, description and default. Static data,
readable with no map loaded.
Remarks
The module owns whether flow is shown and which roads show it; the look of the flow lines is
StylingModule's traffic.flow.* knobs. The filters.any.0.* knobs set the first of the
filters.any alternatives; the further ones a road may match instead are config only, and so
are events.
Every TrafficFlowModule knob with its kind, description and default. Static data, readable with no map loaded.