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Motorist speed cameras in the U.S. and Europe

In this Nov. 12, 2013 photo is a highway sign warning motorists along Interstate 380 in Cedar Rapids, Iowa that the speed limit is enforced by cameras. New state rules to rein in the use of speed cameras after their rapid expansion have set off a furor in municipalities that reflects how prized the cameras have become in many cities and how important they are to their budgets. (AP Photo/Ryan J. Foley)

Speed cameras in the U.S. and Europe

Unmanned "speed cameras" that enforce local speed limits have become a common roadside feature across the United States, but few places have embraced the devices with the zeal of Iowa.

Across the state, cities big and small have installed the cameras to deter speeding and generate revenue from tickets. The cameras now produce more than 200,000 tickets and $13 million in fines annually, or more than $4 per Iowa resident. (AP)