Racing Line Simulator
Shape the fastest line through any corner by dragging control points. Hit Play to run a physics-based simulation and see your speed, grip, and corner time.
Corner
Car
Goal
How It Works
Drag the orange dots on the track to shape your racing line. The physics engine calculates speed, grip usage, and corner time in real time.
Compare your line against early, geometric, and late apex references.
Learn: Cornering Fundamentals
Braking Point
The marker where you begin braking. Brake too late and you overshoot. Brake too early and lose time. Trail braking — gradually releasing brake into the corner — loads front tires for better turn-in.
Turn-In
Where you begin steering into the corner. Good turn-in sets up the entire corner. Too early = miss apex. Too late = can't carry speed.
Apex
The innermost point of your line. Early apex feels natural but sacrifices exit speed. Late apex opens up the exit and allows earlier throttle — often faster overall.
Track-Out
Where the car reaches the outside on exit. A good exit line is wide and straight, allowing full throttle sooner. When a long straight follows, exit speed matters most.
Traction Circle
Tires have a finite grip budget shared between braking, cornering, and acceleration. Combined demand can't exceed the limit — this is why you can't brake and turn hard simultaneously.
Trail Braking
Gradually releasing the brake into the corner keeps front tires loaded, improving rotation. Too much trail brake can cause oversteer; too little causes understeer on entry.