Traffic lights function required data from
1. OSM (accurate but incomplete in most countries, for some European countries it's ok but for US it sucks)
2. Collect by processing track from logger. I wrote a proggy that did that; so I just turn logger on phone and drive around, then process .gpx file for speed changes to find intersections with stop (from stop sign or traffic light)
3. I think in near future traffic light data will be part of map since HERE is now owned by car manufacturers and they are working on automated driving
Once you have that data, it's just another alert type that NNG can already handled.
Regarding simulation, that is correct and I mentioned that. It's very strange, I'm calling the same routine as Simulation under Route Summary and you can sometime see it flash on screen then disappeared. Didn't have time to investigate more into it.
Update: Here is a mod to change heading to be 0-360 clockwise (that is: North=0/360, East=90, South=180, West=270) and also "partial solution" to the simulation menu/icon (initial speed is 2X instead of 1X) but once it disappeared, it won't come back. Odd, I'll investigate further later, getting sleepy now.
Spoiler: .
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