: The game engine's reliance on frame-based calculations means that high-performance modern CPUs process AI updates too quickly.

Are you using any major mods like or Project Paradise ? What graphics card (GPU) does your computer have?

Set to Enhance the application setting or Off . Set Ambient Occlusion to Off .

(TDU) is a notorious bug primarily affecting the PC version of the original game. This glitch often results in players colliding with unseen obstacles or being chased by ghost-like sirens. The Core Fix: Capping Your Frame Rate

Ensure your game is updated to official version first.

On some systems, controllers can interfere with game UI and logic. If you see "grey boxes" or other UI glitches alongside invisible cars, unbind the map controls for your controller in the game's control settings. Are you experiencing this on the original TDU , or Test Drive Unlimited - PCGamingWiki PCGW

: AI traffic making "snap" turns that look like instant horizontal shifts.

Imagine this: You are blasting down the highway at 180 mph in your tuned Pagani Zonda. Suddenly, the "Wanted" star appears. Sirens blare, but the road ahead looks empty. Then—BAM! You crash into nothing. Your multiplier resets. The cop that hit you is completely invisible.

: Ensure you are running the latest official version. Patch 1.66A includes various stability improvements and fixes for "flying" or erratic traffic.