Slowly the strong currents of the Garonne erode the foundations of the Pont de Pierre, so from time to time work is needed to reinforce them. In the city's tradition of making a virtue of a necessity, this has led to the Pont de Pierre becoming a great big cycle-path right in the heart of the city for the months of August and September. Trams and buses can use it, as well as pedestrians, but no cars, vans or lorries.
A group called Vélo-cité held a quick party in the middle of the bridge to mark the beginning of the two months. The Mayor of Bordeaux says that if traffic is paralysed then the bridge can be reopened, but I should think that for August all should be well. It's holiday month anyway, and the bridge only allows single-file traffic in each direction.