Traffic police SMS notification is illegal within 30 days.

Legal analysis: If a party fails to perform the decision on administrative punishment within the time limit, the administrative organ that made the decision on administrative punishment may take the following measures:

(a) if the fine is not paid at the due date, a fine of 3% of the fine amount shall be imposed every day;

(two) apply to the people's court for compulsory execution.

Legal basis: Article 90 of the Law of the People's Republic of China on Road Traffic Safety, if a motor vehicle driver violates the provisions of laws and regulations on road traffic safety, he shall be given a warning or fined from 20 yuan to 200 yuan. If there are other provisions in this law, it shall be punished in accordance with its provisions.