fn make_stages(
ts: &mut ControlTrafficSignal,
map_config: &MapConfig,
i: &Intersection,
stage_specs: Vec<Vec<(Vec<RoadID>, TurnType, bool)>>,
)fn make_stages(
ts: &mut ControlTrafficSignal,
map_config: &MapConfig,
i: &Intersection,
stage_specs: Vec<Vec<(Vec<RoadID>, TurnType, bool)>>,
)