This research paper deals with the effect of P,PI& PID controller in conventional cruise control which was implemented on a passenger car. Conventional cruise control takes over the accelerator operation at speeds over 40 km/h (25 mph) when it is engaged. An accurate positioning motor, with power amplifier that accepts a lowpower (almost no current) voltage signal, and moves the accelerator pedal in a manner proportional to the voltage signal. . This paper deals with the design, and estimation of the controllers for steady state behavior.