addSensor(rightRearTouchSensor);
addSensor(leftRearTouchSensor);
final int angle = 25;
leftRangefinder = new SingleRangefinder(0, 40, -angle, this, obstacles);
rightRangefinder = new SingleRangefinder(0, 40, angle, this, obstacles);
addSensor(leftRangefinder);
addSensor(rightRangefinder);
}