This study aim to control automotive using biosignals reacted before drivers step on the brake pedal in traffic accidents occurrence. We measured reaction time and electromyogram from lower extremity of middle-aged generation. Electromyogram measure using lower extremity muscular group for pedal operating analysis, included tibialis anterior, rectus femoris, peroneus longus and vastus medialis. The experimental results showed a superior response to change, regardless of the tibialis anterior pedal.Electromyogram of tibialis anterior was reacted at the moment of releasing the accelerator, regardless of age.