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the navmesh (navigation mesh) it’s a mesh that npc’s use to determine the movement and the pathfinding to avoid obstacles and move in a some sort of intelligent way. It consists of a network of interconnected polygons that cover the walkable/drivable surfaces (roads, sidewalk)
is also used by unreal engine, so i also redirect you to their documentation: Modifying the Navigation Mesh in Unreal Engine | Unreal Engine 4.27 Documentation -
you can probably use the driving style flag: 16777216
you can use this site to generate and understand driving style better: Driving Style Calculator - GTA V
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