Traffic artificial intelligence (AI) is one of the most visible yet under-appreciated systems in an open-world driving game. In Grand Theft Auto V (2013), urban traffic was widely considered serviceable but mechanical: vehicles followed simple lane-following splines, reacted to the player only within tight proximity bubbles, and frequently exhibited the "GTA traffic" stereotype of swerving into the player or freezing at intersections. By contrast, Red Dead Redemption 2 (RDR2), Rockstar's 2018 release, demonstrated a substantial leap in ambient-world simulation, with non-player characters (NPCs), wagons, horses, and townsfolk responding contextually to events around them (Rockstar Games, 2018). Grand Theft Auto VI (GTA VI), scheduled for release on 19 November 2026 (Rockstar Games, 2025), is widely expected by analysts and journalists to translate the lessons of RDR2's "living world" architecture into a dense, modern urban context centred on Vice City. This report examines the sophistication of RDR2's ambient-traffic and NPC AI, surveys publicly available indications about GTA VI's traffic simulation, and discusses the likely improvements to urban traffic AI in the upcoming title.
Although RDR2 is set in 1899 and therefore lacks motor vehicles, its "traffic" of stagecoaches, wagons, horses, trains, and pedestrians functions as a direct technical analogue to modern vehicular traffic, and Rockstar has repeatedly stated that the same Rockstar Advanced Game Engine (RAGE) underpins both titles (Macgregor, 2018; Rockstar Games, 2025). RDR2's ambient world is governed by a layered behaviour system in which NPCs possess daily routines: shopkeepers open and close stores at set hours, farmers tend livestock at dawn, drunks emerge from saloons at night, and travellers move between settlements along predictable but interruptible paths (Macgregor, 2018). Wagon drivers brake for obstacles, yield at narrow bridges, react to gunfire by fleeing or taking cover, and remember the player's prior interactions through a recognition system that tags individual NPCs with memory of insults, assistance, robberies, or witnessed crimes (Rockstar Games, 2018).
Critically, RDR2 introduced what designers have described as a "needs-based" simulation: animals and NPCs hunger, sleep, and respond to weather, meaning that traffic patterns shift with time of day, weather, and in-world events such as a public hanging or a saloon brawl (Macgregor, 2018). Horses themselves possess detailed locomotion AI, with collision avoidance, fatigue, and emotional states (fear, calm, aggression) that affect speed and steering. Pedestrians on town boardwalks step aside for riders, but only if approached at a non-threatening pace; ride into a town at a gallop and citizens scatter, lawmen draw weapons, and witness chains propagate through the local population (Wikipedia, 2025a). This combination of routine, reactivity, and memory is widely regarded as the high-water mark of open-world ambient simulation prior to GTA VI's announcement (Schreier, 2022).
Although Rockstar has not published a technical breakdown of GTA VI's traffic systems, several public sources allow informed inference. First, GTA VI is confirmed to run on an evolved version of RAGE, the same engine family used for RDR2 (Wikipedia, 2025b), implying inheritance of RDR2's ambient-AI infrastructure rather than a return to GTA V's older systems. Second, journalist Jason Schreier has reported that GTA VI's development has emphasised systemic depth over scripted set-pieces, with Rockstar leveraging the lessons of RDR2's living world for a contemporary urban map centred on Vice City and the wider state of Leonida (Schreier, 2022; Wikipedia, 2025b).
The two official trailers and the accompanying 70-screenshot website update released in May 2025 depict densely populated beaches, multi-lane interstates, traffic jams, parked-vehicle clutter, and visibly varied driver behaviour, including aggressive drivers, slow tourists, and emergency vehicles (Wikipedia, 2025b). Commentary articles cataloguing trailer details note pedestrians filming events on smartphones, livestreamers, body-camera-equipped police, and crowd reactions consistent with RDR2-style witness propagation rather than GTA V's binary "wanted level" model (Wikipedia, 2025b). Expected improvements over GTA V therefore include: (i) lane-discipline and merging behaviour that reacts to congestion rather than rigid spline-following; (ii) driver "personalities" (cautious, aggressive, distracted) influencing braking, honking, and overtaking; (iii) contextual reactions to player driving, such as rubbernecking at crashes, recording incidents on phones, or calling 911; (iv) traffic density tied to time of day, weather, and in-game events such as concerts or hurricanes implied by Florida-based setting (Wikipedia, 2025b); and (v) emergency-services AI that triages and routes around obstructions rather than spawning on top of the player.
The eighth-generation hardware constraints that shaped GTA V have been replaced by PlayStation 5 and Xbox Series X/S architectures with substantially more memory bandwidth, faster storage, and dedicated CPU headroom (Wikipedia, 2025b). This permits a larger active-simulation radius around the player, meaning vehicles can retain state when offscreen rather than despawning, supporting the persistent-world ambitions Rockstar demonstrated in RDR2 (Macgregor, 2018). Combined with the reported budget exceeding US$1 billion and a development team of thousands (Wikipedia, 2025b), the studio has the resources to author the volume of bespoke driver-behaviour data needed to make urban traffic feel like a true ecosystem rather than a backdrop.
Traffic AI in GTA VI is unlikely to be a marginal upgrade over GTA V; it will almost certainly inherit and extend the routine-based, memory-aware, reactive ambient-simulation architecture that defined RDR2, applied to a dense modern urban map. While Rockstar's pre-release silence on technical specifics requires caution, the convergence of engine continuity, hardware capability, observed trailer behaviour, and journalistic reporting points to a traffic system that simulates drivers as individuals with goals, moods, and memory, rather than as interchangeable spline-followers.
Macgregor, J. (2018) 'Red Dead Redemption 2 is a stunning achievement in open-world design', PC Gamer. Available at: https://www.pcgamer.com (Accessed: 12 May 2026).
Rockstar Games (2018) Red Dead Redemption 2. New York: Rockstar Games.
Rockstar Games (2025) Grand Theft Auto VI – Official Trailer 2. Available at: https://www.rockstargames.com/VI (Accessed: 12 May 2026).
Schreier, J. (2022) 'Rockstar Games confirms Grand Theft Auto VI is in development', Bloomberg News, 4 February. Available at: https://www.bloomberg.com (Accessed: 12 May 2026).
Wikipedia (2025a) Red Dead Redemption 2. Available at: https://en.wikipedia.org/wiki/Red_Dead_Redemption_2 (Accessed: 12 May 2026).
Wikipedia (2025b) Grand Theft Auto VI. Available at: https://en.wikipedia.org/wiki/Grand_Theft_Auto_VI (Accessed: 12 May 2026).