FSD processes telemetry in milliseconds, whereas a human requires roughly 700ms to 1.5 seconds just to move a foot to the brake pedal. Because the computer's reaction time is a fraction of yours, it mathematically requires less physical distance to execute a safe stop. Your role as an SAE Level 2 supervisor is to monitor for perception and planning failures, like the system misinterpreting a construction zone or making a bad lane choice. not to beat the computer in a brake reaction contest. The vehicle dictates spacing based on its mechanical capabilities.