Saudi Arabia banned tinted car windows on Sunday in a move aimed at preventing militants escaping detection on the kingdom's roads.
An Interior Ministry statement published by the official Saudi Press Agency said drivers will have a maximum of a year to clear their windows - except for one behind the driver's seat.
Many cars in the deeply conservative Muslim Gulf state have darkened windows to protect the privacy of passengers, particularly women. But officials say militants may have used tinted windows to avoid being spotted by security forces. Sunday's decree specified that even remaining shaded passenger window must be 70 percent transparent.