RealRoads SignalFlow Plus for American Truck Simulator
RealRoads add-on that cuts pointless AI waits at traffic lights, yields and company exits. It doesn't add traffic. Free, for ATS 1.60 or later.
Download RealRoads SignalFlow Plus
More screenshots on Steam Workshop ↗
What this mod does
RealRoads SignalFlow Plus is an optional add-on in snazzyatoms‘s RealRoads series. It doesn’t add traffic: it focuses on keeping the AI from getting stuck at traffic lights, stop lines, yields, company exits and tight intersections.
What it does
- Reduces needless hesitation when stopping or braking.
- Gets yield conflicts resolved sooner, so a failed attempt doesn’t block the line for as long.
- Conservatively tunes AI safety and patience to avoid pileups.
- Keeps SCS’s vehicle cap and smooths out hard braking without making traffic aggressive.
According to the author, it also reduces AI stopping on green before turning right. Version 0.2.4 improved queue recovery after a reported blockage at the Union Pacific yard exit in Laredo.
Compatibility and order
Made for ATS 1.60 or later, it pairs with the RealRoads presets (Echo Flow, Light, Medium, Heavy), of which you should only have one. Place it above the preset. It doesn’t touch vehicle lists or remove cars from third-party packs, but it edits traffic_data.sii and traffic_rules.sii: if another mod changes those files or the signal timings, the one higher up wins.
Limits
It doesn’t fix broken map routes; you may still get the odd jam in yards, construction zones or single-lane roads.
Holyfix Check
Will it work with your mods?
Load your game.log.txt and check whether this mod is for your ATS version, whether you're missing a mod or DLC it needs and where to place it.
It's in Documents › American Truck Simulator › game.log.txt. It's read in your browser: the file is never uploaded.
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User rating
Highlights and things to keep in mind
- Fewer ridiculous jams at company exits
- Very lightweight
- Respects SCS's vehicle cap
- Clashes with mods that edit traffic_rules.sii or traffic lights
- Doesn't fix broken map routes
- A June version affected red lights and stops; now fixed
Requirements
- American Truck Simulator 1.60 or later
- Steam account
- Recommended: a RealRoads AI Traffic preset (Echo Flow, Light, Medium or Heavy)
How to install it
- Open the RealRoads SignalFlow Plus page on Steam Workshop and click Subscribe.
- Also subscribe to a single RealRoads AI Traffic preset if you don't use one yet.
- In the Mod Manager, place SignalFlow Plus above the preset.
- If another mod changes signal timings, decide which one should win and put it higher.
Version history
-
0.2.422 Jul 2026Current
Queue recovery: SCS cap restored, neutral patience and faster yielding
-
—8 Jun 2026
Removed a rule that interfered with red lights, stops and speed limits; 35 s green phases kept
Common problems
Does it add more traffic?
No. It only changes AI behavior at intersections, traffic lights and yields.
Does it need a RealRoads preset?
It's designed to pair with them; the author says it should go above the preset.
Does it stop the AI from stopping on green to turn?
The author says it reduces that behavior.
Is it compatible with other traffic light mods?
If they edit the same files, the one higher in the list wins.
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