What are the red signs on taxis in Baoding?

It may be an advertising slogan, which is illegal.

The relevant person in charge of the Baoding Transportation Department stated that the special operation strives to basically eliminate illegal rear window advertisements posted by taxis within two months, thoroughly purify the taxi advertising market, and brighten the taxi window in the city.

Baoding was known as Shanggu, Baozhou, Shoocheng and Baofu in ancient times. It is located in the center of Hebei Province and at the eastern foot of Taihang Mountain. It is the central city in the Beijing-Tianjin-Hebei region.