During a feud in 2009, the mayors of two neighboring Parisian suburbs each declared the same street one-way, but in opposite directions – resulting in chaos. The national police were called in to assist. – WTF Fun Facts
Source: https://www.telegraph.co.uk/news/newstopics/howaboutthat/6127669/Feuding-Paris-mayors-declare-street-one-way-in-opposite-directions.html
WTF Fun Fact – One Way Wrong Way
If they did, there would be a no entry sign at each end of the street, resulting in zero traffic, instead of chaos…