This is getting to be a bit of a habit: some of Central London's 'jamcams' - webcams to monitor the traffic - are down today, "operational reasons so that maintenance can be performed".

Entirely coincidentally, the webcams that need to be maintained are lined along the major routes for today's annual May Day demofest.

Even more coincidentally, London's jamcams also went dark for two big Stop the War demo days earlier this year.

Ah for the good old May Days! ®

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