If the public security organ doesn't stamp the Decision on Administrative Punishment of Public Security Traffic Management and the parties don't sign it, will the punishment take effect?
According to the Administrative Punishment Law, "the written decision on administrative punishment must be stamped with the seal of the administrative organ that made the decision on administrative punishment." In this case, the punishment decision was not stamped, which constituted a violation of procedure. You can apply for administrative reconsideration or bring an administrative lawsuit, and request to cancel the punishment decision.