Both the motors should remain stationary:
module.exports.motor_stop = function(callback){ clearInterval(leftIndicatorHandler); clearInterval(rightIndicatorHandler); enable_1.digitalWrite(0); input_1.digitalWrite(0); input_2.digitalWrite(0); enable_2.digitalWrite(0); input_3.digitalWrite(0); input_4.digitalWrite(0); green_LED.digitalWrite(0); red_LED.digitalWrite(0); console.log ("Motor Stopped") callback ("Motor Stopped")}