Police vehicle driving along the deserted Silk Road in the Gobi desert near Turfan, Xinjiang, China, Asia

Police station on beach, green hill and palm trees, Great Harbour, Jost Van Dyke, British Virgin Islands, West Indies, Caribbean, Central America

HM Revenue and Customs stopping vehicles and dipping petrol tanks to test for illegal use of red diesel to avoid paying duty, near Skipton, Yorkshire, England, United Kingdom, Europe

HM Revenue and Customs stopping vehicles and dipping petrol tanks to test for illegal use of red diesel to avoid paying duty, near Skipton, Yorkshire, England, United Kingdom, Europe

A group of police wearing protective suits in Carnforth, England, United Kingdom, Europe

Melbourne police staging a campaign to stop and check drivers for drinking and driving and taking drugs and driving, Victoria, Australia, Pacific

Police police cars in front of Tchaikovsky Concert Hall, Mayakovsky Square, Moscow, Russia

A row of police cars, Mayakovsky Square, Moscow, Russia