Legal analysis: illegal. Advertising at traffic lights is a dangerous behavior, which not only threatens the publisher's own safety, but also affects the driving safety of passing vehicles. In response to such illegal acts, the traffic police department will strengthen on-site law enforcement and will rectify such acts.

Legal basis: Article 23 of the Law of People's Republic of China (PRC) on Public Security Administration Punishment commits one of the following acts, and shall be given a warning or fined not more than 200 yuan; If the circumstances are serious, he shall be detained for more than 5 days 10 days, and may also be fined up to 500 yuan:

(1) Disrupting the order of organs, organizations, enterprises and institutions, resulting in work, production, business, medical treatment, teaching and scientific research not being carried out normally, but causing no serious losses; (2) disturbing the order of stations, ports, docks, airports, shopping malls, parks, exhibition halls or other public places; (3) disturbing the order on buses, trams, trains, ships, aircraft or other public transport; (four) illegal interception or forced boarding, boarding motor vehicles, ships, aircraft and other means of transportation, affecting the normal running of vehicles; (5) disturbing the election order conducted according to law.

If people gather to commit the acts mentioned in the preceding paragraph, the ringleaders shall be detained for more than 10 and less than 15, and may also be fined less than 1000 yuan.