The gate for the Campbell Draw Tank, Coconino National Forest, Arizona, United States of America

National Park staff spray weed killer on introduced plant species that are out-competing native flora in the Snowy Mountains, New South Wales, Australia, Pacific

A speed camera

National Park staff spray weed killer on introduced plant species that are out-competing native flora in the Snowy Mountains, New South Wales, Australia, Pacific

Closed storm surge barrier The Oosterscheldekering (Eastern Scheldt storm surge barrier) between the islands Schouwen-Duiveland and Noord-Beveland, part of the Delta works series of dams, protecting the Netherlands from flooding, Netherlands

DEU, Germany, Essen: Traffic speed control in a speeding zone of 30 km/h near a school, with a laser measure gun. Daily police life. Officer from a city police station.

Velocimetry, velocity measurement with a laser gun, RIEGEL FG21-P

Velocimetry, velocity measurement with a laser gun, RIEGEL FG21-P

Roadside country fire gauge, Victoria, Australia

Passport control area at an airport

Optician's equipment to control eyes, preliminary examination of the eyes for the fitting of contact lenses

Speeding driver, radar speed control camera on the Inn Valley motorway A12 in the direction of Kufstein shortly before Innsbruck, Austria, Europe

Satellite in front of the globe with Europe, symbolic image Galileo navigation system, overhead intelligence, data transmission

Solar installation technician checking solar panels with a measuring device

Velocimetry, velocity measurement with a laser gun, RIEGEL FG21-P

Surveillance camera on a red wall.

Dummy with the equipment of a mine rescuer

Young woman with white lab coat measuring controller with meter, Austria, Europe

Closed storm surge barrier The Maeslantkering in the Nieuwe Waterweg waterway between Hoek van Holland and Maassluis, part of the Delta Works, Netherlands

Fire prevention mark of a fire hydrant at the Ministry of Finance in Berlin, symbolic picture

Closed storm surge barrier The Maeslantkering in the Nieuwe Waterweg waterway between Hoek van Holland and Maassluis, part of the Delta Works, Netherlands

Fire extinguishers on wheels at Michigan International Speedway which features a two-mile race track and seats nearly 120, 000 fans for NASCAR races, Brooklyn, Michigan, USA, America

Bagni di Pisa, Terme di San Giuliano, Pisa, Toscana, Italy

Bagni di Pisa, Terme di San Giuliano, Pisa, Toscana, Italy