What do Americans call roundabouts?
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                            Then forward-thinking British traffic engineers like Frank Blackmore tinkered with the designs and the UK established the modern roundabout by introducing a mandatory "Give way" rule for cars entering. The US still has the older versions, called rotaries or circles, notably in New Jersey and Washington DC. 
                    
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                                   Then forward-thinking British traffic engineers like Frank Blackmore tinkered with the designs and the UK established the modern roundabout by introducing a mandatory "Give way" rule for cars entering. The US still has the older versions, called rotaries or circles, notably in New Jersey and Washington DC. 
                                
                            
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