The electronic cruise control (ECC) system on automatic cars allows the driver to set and maintain a specific vehicle speed without continuously pressing the accelerator pedal. This can be useful on long road trips or in heavy traffic where the driver wants to maintain a steady speed without having to constantly adjust the accelerator. The ECC system typically uses a combination of sensors and electronic controls to monitor the vehicle's speed and maintain the set speed. Some ECC systems also include additional features such as the ability to resume the previously set speed, adjust the speed in increments, or disengage the system completely.