Budapest Critical Mass.

Makes London CM look like a bunch of compliant wimps. Notice the
reference to 'World Car Free Day', something the London doesn't seem
to recognise, unlike loads of other cities. That is because the car is
King here.

"Hungary’s cyclist community will once again hold the “Critical Mass”
mass bike ride to “promote one of the most environmentally friendly
forms of travel and raise awareness about the need to improve cycling
conditions in the city”. On the annual World Car Free Day of 22
September, cyclists will start at 5.30 p.m. Budapest Town Hall, near
Déak tér, where they plan to encircle the building with thousands of
locked bikes. The demonstration is to protest the council’s and Mayor
Gábor Demszky’s decision to abandon one of the cycle paths promised as
part of the renovation of the Margit Bridge. The riders will then
begin with a customary bike lift at 6.35 p.m. and end with another at
City Hall Park at 8.00 p.m. In the meantime cyclists will circle the
Nagykörút (Grand Boulevard). This year police are not closing any
roads to motor traffic, but expect delays."

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Critical Mass London
http://www.criticalmasslondon.org.uk
"More bikes, fewer cars!".