It sounds like you're looking for a guide on how to get more realistic traffic car models (often called "2Real" or similar high-quality packs) into a "Traffic Tool" — likely referring to mods like Traffic Manager: President Edition (TMPE), Realistic Traffic mods for Cities: Skylines, or a similar simulation/game tool.
Density & Performance: Built on a LUA-based system, it is highly performance-friendly, allowing for massive traffic counts without the long loading times associated with traditional AI. 2real more traffic cars for traffic tool 10
Dynamic Physics: Features full physical collision boxes and (as of recent updates) deformable car bodies for visual crash damage. It sounds like you're looking for a guide