There has been traffic chaos in two Paris suburbs after their feuding mayors declared the same busy road one-way, but in opposite directions.
Patrick Balkany, the conservative mayor of Levallois-Perret, initially made the D909 one-way to reduce the amount of commuter traffic through his district.
But Gilles Catoire, the Socialist mayor of neighbouring Clichy-la-Garenne, said this increased congestion in his area.
He made his section of the road one-way in the opposite direction.
With the contradictory road-signs in place, the unsurprising result was gridlock, prompting the deployment of municipal and national police to direct traffic away from the area.
"What Clichy has done is not a long-term solution, but it is a response to a unilateral decision by the town of Levallois," Clichy's deputy mayor, Alain Fournier, was quoted as saying by AFP news agency.
But Mr Balkany insisted: "The mayor of Clichy has taken a position that is unreasonable and is hurting his own constituents."
Thousands of motorists pass between the two suburbs each day on their way into and out of the French capital.