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Investigations are underway in Holland to find out how pranksters got to traffic lights to put a rude picture where the green lamp should be.
According to the Metro, someone changed the set of stop signals in Nimwegen so that whenever they turned to 'go', an LED image of a stick figures making love flashed up.
The trick caused chaos at the junction, as motorists stopped to gawp at the picture and pedestrians kept pressing crossing buttons to try and bring it back.
"We had quite a lot of rear end shunts from drivers who were too distracted," a police officer commented.
The Town Hall is now looking into who would have had access to the mechanisms that control the lights - presumably so that heads can roll for playing the prank!
According to a New York Times article, the normal function of traffic lights requires sophisticated control to make sure that traffic moves evenly and safely.
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