Racetrack Lab

Draw a track and race a car driven by a Python controller.

Pick a circuit or draw your own with the mouse, then race the yellow car around it. It's driven by a real Python controller running in your browser. It uses a kinematic bicycle model with heading and lateral-error feedback. Arrow keys or WASD to drive. Beat it if you can.

Pick a circuit above, or drag here to draw your own

You–best –

AI–best –

Target–drive a lap

StatusWarming up Python…drawing works already

Tuning: the AI's gains

K_heading 2.5

K_lateral 0.03

K_steer 9

v_max 190

a_lat 280

Lookahead 16

Track width 30

Watch speed × 1

v_max and a_lat apply to both cars, so the race stays fair. Changing anything here clears the lap records for this circuit.

controller.py: edit the Python that drives the AI

The full simulator (vehicle model, error computation, lap logic) is in lab_sim.py. Only controller() is swapped in when you apply.