A Mode: Cornering
If the accelerator pedal is rapidly released before the car corners, an upshift does not take place, nor does an upshift take place while the car is cornering.
If an upshift were to occur while the car was cornering, the braking effect of the engine would be reduced or cancelled entirely, which in turn could reduce the car's rate of deceleration and it would be necessary to change back down to improve acceleration to accelerate out of the corner.
Cornering is detected by the SMG II control unit by means of the DSC lateral acceleration and steering angle detection.