Using mobile phone text messaging to warn female drivers and passengers who violate the compulsory hijab and dress code in Thran started in November 2017. “The experiment by the capital’s police to text notices to car owners who violate the hijab rule has proven successful,” Theran's prosecutor said. “The move is aimed at reducing traffic accidents in Tehran,” the city's Prosecutor General said at the time. The reference to accidents means that women without proper hijab distract other drivers, according to law enforcement.