What is the reason for pressing the left line at the second curve during serpentine driving?

[StMackenzie]

Pressing the left line at the second curve during serpentine driving is due to improper speed control, failure to identify the correct reference point, or turning the steering wheel too quickly and abruptly. S-curve entrance: When entering from the left, keep the vehicle as close to the right line as possible before turning the steering wheel to the left; when entering from the right, keep the vehicle as close to the left line as possible before turning the steering wheel to the right. During the movement, the front of the vehicle should follow the edge line. When turning left, the front of the vehicle should follow the right line; when turning right, the front of the vehicle should follow the left line. S-curve exit: When exiting to the left, turn the steering wheel half a turn to the right as the front wheels just leave to avoid the rear wheels pressing the line; when exiting to the right, turn the steering wheel half a turn to the left as the front wheels just leave to avoid the rear wheels pressing the line. Whether turning left or right, always observe through the large circular mirror to maintain a distance of about 30 centimeters between the vehicle body and the edge line.