In what way and within how many days will the traffic police inform the owners of motor vehicles in Shanghai that they violate the rules? Are there any relevant regulations?

According to the Regulations on Handling Procedures for Road Traffic Safety Violations, the penalties for traffic violations should be announced within 15 days, including letters (rarely used now), mobile phone short messages and traffic control network (for public inquiry). As long as one of the methods is used, the punishment will be cancelled if it is published within the time limit. So you can check the website or the traffic police APP, as long as it is published within 15 days after the violation date, it is legal and valid. In addition, if the mobile phone number changes, you should register your personal information at the traffic police official website or the vehicle management office window in time.