Highlights of high-speed rail seat indicators

The seat number of "Fuxing" is changed to LED display. I believe most people already know it, but I found that the corresponding indicator lights have different colors, namely: red, yellow, and green. Through my observation all the way, I found the rule:

First of all, red means that the seat has been sold. As shown in the picture below, A is my seat, and B is the seat of the elder brother. The lights of these two seats in the whole car are red.
Then yellow means that the seat has been pre-sold, indicating that there will be passengers in the next section of this seat
Green means the seat is for sale and the ticket has not been sold yet.

This can be regarded as one of the highlights of the "Fuxing", passengers can judge the sales of seats by the color on the display. If a passenger buys a "no-seat" ticket, he can use the indicator light on the display screen to determine whether the seat is occupied, and he can borrow an unsold seat. This is the first time I discovered the design of this indicator light, and I like the "Fuxinghao". I wonder if you have noticed this bright spot?