The document discusses the application of a PID controller in speed control of a car. It describes creating a basic car model in Simulink and analyzing its performance, which does not meet specifications for pickup time. A P controller is then added, improving pickup time but still resulting in steady state error. A PI controller is tested next, but proves unstable. Finally, with the addition of a D controller to create a full PID controller, all specifications for speed, rise time and steady state error are met, demonstrating how PID control enables effective electronic speed control in automobiles.